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[CIFS] Copy struct *after* setting the port, instead of before.
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / cifs / connect.c
blob12c2cf693555a9611865b5a3ef392febd3ce398c
1 /*
2 * fs/cifs/connect.c
3 *
4 * Copyright (C) International Business Machines Corp., 2002,2009
5 * Author(s): Steve French (sfrench@us.ibm.com)
6 *
7 * This library is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU Lesser General Public License as published
9 * by the Free Software Foundation; either version 2.1 of the License, or
10 * (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
15 * the GNU Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21 #include <linux/fs.h>
22 #include <linux/net.h>
23 #include <linux/string.h>
24 #include <linux/list.h>
25 #include <linux/wait.h>
26 #include <linux/pagemap.h>
27 #include <linux/ctype.h>
28 #include <linux/utsname.h>
29 #include <linux/mempool.h>
30 #include <linux/delay.h>
31 #include <linux/completion.h>
32 #include <linux/kthread.h>
33 #include <linux/pagevec.h>
34 #include <linux/freezer.h>
35 #include <linux/namei.h>
36 #include <asm/uaccess.h>
37 #include <asm/processor.h>
38 #include <linux/inet.h>
39 #include <net/ipv6.h>
40 #include "cifspdu.h"
41 #include "cifsglob.h"
42 #include "cifsproto.h"
43 #include "cifs_unicode.h"
44 #include "cifs_debug.h"
45 #include "cifs_fs_sb.h"
46 #include "ntlmssp.h"
47 #include "nterr.h"
48 #include "rfc1002pdu.h"
49 #include "cn_cifs.h"
50
51 #define CIFS_PORT 445
52 #define RFC1001_PORT 139
53
54 extern void SMBNTencrypt(unsigned char *passwd, unsigned char *c8,
55 unsigned char *p24);
56
57 extern mempool_t *cifs_req_poolp;
58
59 struct smb_vol {
60 char *username;
61 char *password;
62 char *domainname;
63 char *UNC;
64 char *UNCip;
65 char *iocharset; /* local code page for mapping to and from Unicode */
66 char source_rfc1001_name[16]; /* netbios name of client */
67 char target_rfc1001_name[16]; /* netbios name of server for Win9x/ME */
68 uid_t linux_uid;
69 gid_t linux_gid;
70 mode_t file_mode;
71 mode_t dir_mode;
72 unsigned secFlg;
73 bool retry:1;
74 bool intr:1;
75 bool setuids:1;
76 bool override_uid:1;
77 bool override_gid:1;
78 bool dynperm:1;
79 bool noperm:1;
80 bool no_psx_acl:1; /* set if posix acl support should be disabled */
81 bool cifs_acl:1;
82 bool no_xattr:1; /* set if xattr (EA) support should be disabled*/
83 bool server_ino:1; /* use inode numbers from server ie UniqueId */
84 bool direct_io:1;
85 bool remap:1; /* set to remap seven reserved chars in filenames */
86 bool posix_paths:1; /* unset to not ask for posix pathnames. */
87 bool no_linux_ext:1;
88 bool sfu_emul:1;
89 bool nullauth:1; /* attempt to authenticate with null user */
90 bool nocase:1; /* request case insensitive filenames */
91 bool nobrl:1; /* disable sending byte range locks to srv */
92 bool mand_lock:1; /* send mandatory not posix byte range lock reqs */
93 bool seal:1; /* request transport encryption on share */
94 bool nodfs:1; /* Do not request DFS, even if available */
95 bool local_lease:1; /* check leases only on local system, not remote */
96 bool noblocksnd:1;
97 bool noautotune:1;
98 bool nostrictsync:1; /* do not force expensive SMBflush on every sync */
99 unsigned int rsize;
100 unsigned int wsize;
101 unsigned int sockopt;
102 unsigned short int port;
103 char *prepath;
104 };
105
106 static int ipv4_connect(struct TCP_Server_Info *server);
107 static int ipv6_connect(struct TCP_Server_Info *server);
108
109 /*
110 * cifs tcp session reconnection
111 *
112 * mark tcp session as reconnecting so temporarily locked
113 * mark all smb sessions as reconnecting for tcp session
114 * reconnect tcp session
115 * wake up waiters on reconnection? - (not needed currently)
116 */
117 static int
118 cifs_reconnect(struct TCP_Server_Info *server)
119 {
120 int rc = 0;
121 struct list_head *tmp, *tmp2;
122 struct cifsSesInfo *ses;
123 struct cifsTconInfo *tcon;
124 struct mid_q_entry *mid_entry;
125
126 spin_lock(&GlobalMid_Lock);
127 if (server->tcpStatus == CifsExiting) {
128 /* the demux thread will exit normally
129 next time through the loop */
130 spin_unlock(&GlobalMid_Lock);
131 return rc;
132 } else
133 server->tcpStatus = CifsNeedReconnect;
134 spin_unlock(&GlobalMid_Lock);
135 server->maxBuf = 0;
136
137 cFYI(1, ("Reconnecting tcp session"));
138
139 /* before reconnecting the tcp session, mark the smb session (uid)
140 and the tid bad so they are not used until reconnected */
141 read_lock(&cifs_tcp_ses_lock);
142 list_for_each(tmp, &server->smb_ses_list) {
143 ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list);
144 ses->need_reconnect = true;
145 ses->ipc_tid = 0;
146 list_for_each(tmp2, &ses->tcon_list) {
147 tcon = list_entry(tmp2, struct cifsTconInfo, tcon_list);
148 tcon->need_reconnect = true;
149 }
150 }
151 read_unlock(&cifs_tcp_ses_lock);
152 /* do not want to be sending data on a socket we are freeing */
153 mutex_lock(&server->srv_mutex);
154 if (server->ssocket) {
155 cFYI(1, ("State: 0x%x Flags: 0x%lx", server->ssocket->state,
156 server->ssocket->flags));
157 kernel_sock_shutdown(server->ssocket, SHUT_WR);
158 cFYI(1, ("Post shutdown state: 0x%x Flags: 0x%lx",
159 server->ssocket->state,
160 server->ssocket->flags));
161 sock_release(server->ssocket);
162 server->ssocket = NULL;
163 }
164
165 spin_lock(&GlobalMid_Lock);
166 list_for_each(tmp, &server->pending_mid_q) {
167 mid_entry = list_entry(tmp, struct
168 mid_q_entry,
169 qhead);
170 if (mid_entry->midState == MID_REQUEST_SUBMITTED) {
171 /* Mark other intransit requests as needing
172 retry so we do not immediately mark the
173 session bad again (ie after we reconnect
174 below) as they timeout too */
175 mid_entry->midState = MID_RETRY_NEEDED;
176 }
177 }
178 spin_unlock(&GlobalMid_Lock);
179 mutex_unlock(&server->srv_mutex);
180
181 while ((server->tcpStatus != CifsExiting) &&
182 (server->tcpStatus != CifsGood)) {
183 try_to_freeze();
184 if (server->addr.sockAddr6.sin6_family == AF_INET6)
185 rc = ipv6_connect(server);
186 else
187 rc = ipv4_connect(server);
188 if (rc) {
189 cFYI(1, ("reconnect error %d", rc));
190 msleep(3000);
191 } else {
192 atomic_inc(&tcpSesReconnectCount);
193 spin_lock(&GlobalMid_Lock);
194 if (server->tcpStatus != CifsExiting)
195 server->tcpStatus = CifsGood;
196 server->sequence_number = 0;
197 spin_unlock(&GlobalMid_Lock);
198 /* atomic_set(&server->inFlight,0);*/
199 wake_up(&server->response_q);
200 }
201 }
202 return rc;
203 }
204
205 /*
206 return codes:
207 0 not a transact2, or all data present
208 >0 transact2 with that much data missing
209 -EINVAL = invalid transact2
210
211 */
212 static int check2ndT2(struct smb_hdr *pSMB, unsigned int maxBufSize)
213 {
214 struct smb_t2_rsp *pSMBt;
215 int total_data_size;
216 int data_in_this_rsp;
217 int remaining;
218
219 if (pSMB->Command != SMB_COM_TRANSACTION2)
220 return 0;
221
222 /* check for plausible wct, bcc and t2 data and parm sizes */
223 /* check for parm and data offset going beyond end of smb */
224 if (pSMB->WordCount != 10) { /* coalesce_t2 depends on this */
225 cFYI(1, ("invalid transact2 word count"));
226 return -EINVAL;
227 }
228
229 pSMBt = (struct smb_t2_rsp *)pSMB;
230
231 total_data_size = le16_to_cpu(pSMBt->t2_rsp.TotalDataCount);
232 data_in_this_rsp = le16_to_cpu(pSMBt->t2_rsp.DataCount);
233
234 remaining = total_data_size - data_in_this_rsp;
235
236 if (remaining == 0)
237 return 0;
238 else if (remaining < 0) {
239 cFYI(1, ("total data %d smaller than data in frame %d",
240 total_data_size, data_in_this_rsp));
241 return -EINVAL;
242 } else {
243 cFYI(1, ("missing %d bytes from transact2, check next response",
244 remaining));
245 if (total_data_size > maxBufSize) {
246 cERROR(1, ("TotalDataSize %d is over maximum buffer %d",
247 total_data_size, maxBufSize));
248 return -EINVAL;
249 }
250 return remaining;
251 }
252 }
253
254 static int coalesce_t2(struct smb_hdr *psecond, struct smb_hdr *pTargetSMB)
255 {
256 struct smb_t2_rsp *pSMB2 = (struct smb_t2_rsp *)psecond;
257 struct smb_t2_rsp *pSMBt = (struct smb_t2_rsp *)pTargetSMB;
258 int total_data_size;
259 int total_in_buf;
260 int remaining;
261 int total_in_buf2;
262 char *data_area_of_target;
263 char *data_area_of_buf2;
264 __u16 byte_count;
265
266 total_data_size = le16_to_cpu(pSMBt->t2_rsp.TotalDataCount);
267
268 if (total_data_size != le16_to_cpu(pSMB2->t2_rsp.TotalDataCount)) {
269 cFYI(1, ("total data size of primary and secondary t2 differ"));
270 }
271
272 total_in_buf = le16_to_cpu(pSMBt->t2_rsp.DataCount);
273
274 remaining = total_data_size - total_in_buf;
275
276 if (remaining < 0)
277 return -EINVAL;
278
279 if (remaining == 0) /* nothing to do, ignore */
280 return 0;
281
282 total_in_buf2 = le16_to_cpu(pSMB2->t2_rsp.DataCount);
283 if (remaining < total_in_buf2) {
284 cFYI(1, ("transact2 2nd response contains too much data"));
285 }
286
287 /* find end of first SMB data area */
288 data_area_of_target = (char *)&pSMBt->hdr.Protocol +
289 le16_to_cpu(pSMBt->t2_rsp.DataOffset);
290 /* validate target area */
291
292 data_area_of_buf2 = (char *) &pSMB2->hdr.Protocol +
293 le16_to_cpu(pSMB2->t2_rsp.DataOffset);
294
295 data_area_of_target += total_in_buf;
296
297 /* copy second buffer into end of first buffer */
298 memcpy(data_area_of_target, data_area_of_buf2, total_in_buf2);
299 total_in_buf += total_in_buf2;
300 pSMBt->t2_rsp.DataCount = cpu_to_le16(total_in_buf);
301 byte_count = le16_to_cpu(BCC_LE(pTargetSMB));
302 byte_count += total_in_buf2;
303 BCC_LE(pTargetSMB) = cpu_to_le16(byte_count);
304
305 byte_count = pTargetSMB->smb_buf_length;
306 byte_count += total_in_buf2;
307
308 /* BB also add check that we are not beyond maximum buffer size */
309
310 pTargetSMB->smb_buf_length = byte_count;
311
312 if (remaining == total_in_buf2) {
313 cFYI(1, ("found the last secondary response"));
314 return 0; /* we are done */
315 } else /* more responses to go */
316 return 1;
317
318 }
319
320 static int
321 cifs_demultiplex_thread(struct TCP_Server_Info *server)
322 {
323 int length;
324 unsigned int pdu_length, total_read;
325 struct smb_hdr *smb_buffer = NULL;
326 struct smb_hdr *bigbuf = NULL;
327 struct smb_hdr *smallbuf = NULL;
328 struct msghdr smb_msg;
329 struct kvec iov;
330 struct socket *csocket = server->ssocket;
331 struct list_head *tmp;
332 struct cifsSesInfo *ses;
333 struct task_struct *task_to_wake = NULL;
334 struct mid_q_entry *mid_entry;
335 char temp;
336 bool isLargeBuf = false;
337 bool isMultiRsp;
338 int reconnect;
339
340 current->flags |= PF_MEMALLOC;
341 cFYI(1, ("Demultiplex PID: %d", task_pid_nr(current)));
342
343 length = atomic_inc_return(&tcpSesAllocCount);
344 if (length > 1)
345 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
346 GFP_KERNEL);
347
348 set_freezable();
349 while (server->tcpStatus != CifsExiting) {
350 if (try_to_freeze())
351 continue;
352 if (bigbuf == NULL) {
353 bigbuf = cifs_buf_get();
354 if (!bigbuf) {
355 cERROR(1, ("No memory for large SMB response"));
356 msleep(3000);
357 /* retry will check if exiting */
358 continue;
359 }
360 } else if (isLargeBuf) {
361 /* we are reusing a dirty large buf, clear its start */
362 memset(bigbuf, 0, sizeof(struct smb_hdr));
363 }
364
365 if (smallbuf == NULL) {
366 smallbuf = cifs_small_buf_get();
367 if (!smallbuf) {
368 cERROR(1, ("No memory for SMB response"));
369 msleep(1000);
370 /* retry will check if exiting */
371 continue;
372 }
373 /* beginning of smb buffer is cleared in our buf_get */
374 } else /* if existing small buf clear beginning */
375 memset(smallbuf, 0, sizeof(struct smb_hdr));
376
377 isLargeBuf = false;
378 isMultiRsp = false;
379 smb_buffer = smallbuf;
380 iov.iov_base = smb_buffer;
381 iov.iov_len = 4;
382 smb_msg.msg_control = NULL;
383 smb_msg.msg_controllen = 0;
384 pdu_length = 4; /* enough to get RFC1001 header */
385 incomplete_rcv:
386 length =
387 kernel_recvmsg(csocket, &smb_msg,
388 &iov, 1, pdu_length, 0 /* BB other flags? */);
389
390 if (server->tcpStatus == CifsExiting) {
391 break;
392 } else if (server->tcpStatus == CifsNeedReconnect) {
393 cFYI(1, ("Reconnect after server stopped responding"));
394 cifs_reconnect(server);
395 cFYI(1, ("call to reconnect done"));
396 csocket = server->ssocket;
397 continue;
398 } else if ((length == -ERESTARTSYS) || (length == -EAGAIN)) {
399 msleep(1); /* minimum sleep to prevent looping
400 allowing socket to clear and app threads to set
401 tcpStatus CifsNeedReconnect if server hung */
402 if (pdu_length < 4) {
403 iov.iov_base = (4 - pdu_length) +
404 (char *)smb_buffer;
405 iov.iov_len = pdu_length;
406 smb_msg.msg_control = NULL;
407 smb_msg.msg_controllen = 0;
408 goto incomplete_rcv;
409 } else
410 continue;
411 } else if (length <= 0) {
412 if (server->tcpStatus == CifsNew) {
413 cFYI(1, ("tcp session abend after SMBnegprot"));
414 /* some servers kill the TCP session rather than
415 returning an SMB negprot error, in which
416 case reconnecting here is not going to help,
417 and so simply return error to mount */
418 break;
419 }
420 if (!try_to_freeze() && (length == -EINTR)) {
421 cFYI(1, ("cifsd thread killed"));
422 break;
423 }
424 cFYI(1, ("Reconnect after unexpected peek error %d",
425 length));
426 cifs_reconnect(server);
427 csocket = server->ssocket;
428 wake_up(&server->response_q);
429 continue;
430 } else if (length < pdu_length) {
431 cFYI(1, ("requested %d bytes but only got %d bytes",
432 pdu_length, length));
433 pdu_length -= length;
434 msleep(1);
435 goto incomplete_rcv;
436 }
437
438 /* The right amount was read from socket - 4 bytes */
439 /* so we can now interpret the length field */
440
441 /* the first byte big endian of the length field,
442 is actually not part of the length but the type
443 with the most common, zero, as regular data */
444 temp = *((char *) smb_buffer);
445
446 /* Note that FC 1001 length is big endian on the wire,
447 but we convert it here so it is always manipulated
448 as host byte order */
449 pdu_length = be32_to_cpu((__force __be32)smb_buffer->smb_buf_length);
450 smb_buffer->smb_buf_length = pdu_length;
451
452 cFYI(1, ("rfc1002 length 0x%x", pdu_length+4));
453
454 if (temp == (char) RFC1002_SESSION_KEEP_ALIVE) {
455 continue;
456 } else if (temp == (char)RFC1002_POSITIVE_SESSION_RESPONSE) {
457 cFYI(1, ("Good RFC 1002 session rsp"));
458 continue;
459 } else if (temp == (char)RFC1002_NEGATIVE_SESSION_RESPONSE) {
460 /* we get this from Windows 98 instead of
461 an error on SMB negprot response */
462 cFYI(1, ("Negative RFC1002 Session Response Error 0x%x)",
463 pdu_length));
464 if (server->tcpStatus == CifsNew) {
465 /* if nack on negprot (rather than
466 ret of smb negprot error) reconnecting
467 not going to help, ret error to mount */
468 break;
469 } else {
470 /* give server a second to
471 clean up before reconnect attempt */
472 msleep(1000);
473 /* always try 445 first on reconnect
474 since we get NACK on some if we ever
475 connected to port 139 (the NACK is
476 since we do not begin with RFC1001
477 session initialize frame) */
478 server->addr.sockAddr.sin_port =
479 htons(CIFS_PORT);
480 cifs_reconnect(server);
481 csocket = server->ssocket;
482 wake_up(&server->response_q);
483 continue;
484 }
485 } else if (temp != (char) 0) {
486 cERROR(1, ("Unknown RFC 1002 frame"));
487 cifs_dump_mem(" Received Data: ", (char *)smb_buffer,
488 length);
489 cifs_reconnect(server);
490 csocket = server->ssocket;
491 continue;
492 }
493
494 /* else we have an SMB response */
495 if ((pdu_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) ||
496 (pdu_length < sizeof(struct smb_hdr) - 1 - 4)) {
497 cERROR(1, ("Invalid size SMB length %d pdu_length %d",
498 length, pdu_length+4));
499 cifs_reconnect(server);
500 csocket = server->ssocket;
501 wake_up(&server->response_q);
502 continue;
503 }
504
505 /* else length ok */
506 reconnect = 0;
507
508 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
509 isLargeBuf = true;
510 memcpy(bigbuf, smallbuf, 4);
511 smb_buffer = bigbuf;
512 }
513 length = 0;
514 iov.iov_base = 4 + (char *)smb_buffer;
515 iov.iov_len = pdu_length;
516 for (total_read = 0; total_read < pdu_length;
517 total_read += length) {
518 length = kernel_recvmsg(csocket, &smb_msg, &iov, 1,
519 pdu_length - total_read, 0);
520 if ((server->tcpStatus == CifsExiting) ||
521 (length == -EINTR)) {
522 /* then will exit */
523 reconnect = 2;
524 break;
525 } else if (server->tcpStatus == CifsNeedReconnect) {
526 cifs_reconnect(server);
527 csocket = server->ssocket;
528 /* Reconnect wakes up rspns q */
529 /* Now we will reread sock */
530 reconnect = 1;
531 break;
532 } else if ((length == -ERESTARTSYS) ||
533 (length == -EAGAIN)) {
534 msleep(1); /* minimum sleep to prevent looping,
535 allowing socket to clear and app
536 threads to set tcpStatus
537 CifsNeedReconnect if server hung*/
538 length = 0;
539 continue;
540 } else if (length <= 0) {
541 cERROR(1, ("Received no data, expecting %d",
542 pdu_length - total_read));
543 cifs_reconnect(server);
544 csocket = server->ssocket;
545 reconnect = 1;
546 break;
547 }
548 }
549 if (reconnect == 2)
550 break;
551 else if (reconnect == 1)
552 continue;
553
554 length += 4; /* account for rfc1002 hdr */
555
556
557 dump_smb(smb_buffer, length);
558 if (checkSMB(smb_buffer, smb_buffer->Mid, total_read+4)) {
559 cifs_dump_mem("Bad SMB: ", smb_buffer, 48);
560 continue;
561 }
562
563
564 task_to_wake = NULL;
565 spin_lock(&GlobalMid_Lock);
566 list_for_each(tmp, &server->pending_mid_q) {
567 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
568
569 if ((mid_entry->mid == smb_buffer->Mid) &&
570 (mid_entry->midState == MID_REQUEST_SUBMITTED) &&
571 (mid_entry->command == smb_buffer->Command)) {
572 if (check2ndT2(smb_buffer,server->maxBuf) > 0) {
573 /* We have a multipart transact2 resp */
574 isMultiRsp = true;
575 if (mid_entry->resp_buf) {
576 /* merge response - fix up 1st*/
577 if (coalesce_t2(smb_buffer,
578 mid_entry->resp_buf)) {
579 mid_entry->multiRsp =
580 true;
581 break;
582 } else {
583 /* all parts received */
584 mid_entry->multiEnd =
585 true;
586 goto multi_t2_fnd;
587 }
588 } else {
589 if (!isLargeBuf) {
590 cERROR(1,("1st trans2 resp needs bigbuf"));
591 /* BB maybe we can fix this up, switch
592 to already allocated large buffer? */
593 } else {
594 /* Have first buffer */
595 mid_entry->resp_buf =
596 smb_buffer;
597 mid_entry->largeBuf =
598 true;
599 bigbuf = NULL;
600 }
601 }
602 break;
603 }
604 mid_entry->resp_buf = smb_buffer;
605 mid_entry->largeBuf = isLargeBuf;
606 multi_t2_fnd:
607 task_to_wake = mid_entry->tsk;
608 mid_entry->midState = MID_RESPONSE_RECEIVED;
609 #ifdef CONFIG_CIFS_STATS2
610 mid_entry->when_received = jiffies;
611 #endif
612 /* so we do not time out requests to server
613 which is still responding (since server could
614 be busy but not dead) */
615 server->lstrp = jiffies;
616 break;
617 }
618 }
619 spin_unlock(&GlobalMid_Lock);
620 if (task_to_wake) {
621 /* Was previous buf put in mpx struct for multi-rsp? */
622 if (!isMultiRsp) {
623 /* smb buffer will be freed by user thread */
624 if (isLargeBuf)
625 bigbuf = NULL;
626 else
627 smallbuf = NULL;
628 }
629 wake_up_process(task_to_wake);
630 } else if (!is_valid_oplock_break(smb_buffer, server) &&
631 !isMultiRsp) {
632 cERROR(1, ("No task to wake, unknown frame received! "
633 "NumMids %d", midCount.counter));
634 cifs_dump_mem("Received Data is: ", (char *)smb_buffer,
635 sizeof(struct smb_hdr));
636 #ifdef CONFIG_CIFS_DEBUG2
637 cifs_dump_detail(smb_buffer);
638 cifs_dump_mids(server);
639 #endif /* CIFS_DEBUG2 */
640
641 }
642 } /* end while !EXITING */
643
644 /* take it off the list, if it's not already */
645 write_lock(&cifs_tcp_ses_lock);
646 list_del_init(&server->tcp_ses_list);
647 write_unlock(&cifs_tcp_ses_lock);
648
649 spin_lock(&GlobalMid_Lock);
650 server->tcpStatus = CifsExiting;
651 spin_unlock(&GlobalMid_Lock);
652 wake_up_all(&server->response_q);
653
654 /* check if we have blocked requests that need to free */
655 /* Note that cifs_max_pending is normally 50, but
656 can be set at module install time to as little as two */
657 spin_lock(&GlobalMid_Lock);
658 if (atomic_read(&server->inFlight) >= cifs_max_pending)
659 atomic_set(&server->inFlight, cifs_max_pending - 1);
660 /* We do not want to set the max_pending too low or we
661 could end up with the counter going negative */
662 spin_unlock(&GlobalMid_Lock);
663 /* Although there should not be any requests blocked on
664 this queue it can not hurt to be paranoid and try to wake up requests
665 that may haven been blocked when more than 50 at time were on the wire
666 to the same server - they now will see the session is in exit state
667 and get out of SendReceive. */
668 wake_up_all(&server->request_q);
669 /* give those requests time to exit */
670 msleep(125);
671
672 if (server->ssocket) {
673 sock_release(csocket);
674 server->ssocket = NULL;
675 }
676 /* buffer usuallly freed in free_mid - need to free it here on exit */
677 cifs_buf_release(bigbuf);
678 if (smallbuf) /* no sense logging a debug message if NULL */
679 cifs_small_buf_release(smallbuf);
680
681 /*
682 * BB: we shouldn't have to do any of this. It shouldn't be
683 * possible to exit from the thread with active SMB sessions
684 */
685 read_lock(&cifs_tcp_ses_lock);
686 if (list_empty(&server->pending_mid_q)) {
687 /* loop through server session structures attached to this and
688 mark them dead */
689 list_for_each(tmp, &server->smb_ses_list) {
690 ses = list_entry(tmp, struct cifsSesInfo,
691 smb_ses_list);
692 ses->status = CifsExiting;
693 ses->server = NULL;
694 }
695 read_unlock(&cifs_tcp_ses_lock);
696 } else {
697 /* although we can not zero the server struct pointer yet,
698 since there are active requests which may depnd on them,
699 mark the corresponding SMB sessions as exiting too */
700 list_for_each(tmp, &server->smb_ses_list) {
701 ses = list_entry(tmp, struct cifsSesInfo,
702 smb_ses_list);
703 ses->status = CifsExiting;
704 }
705
706 spin_lock(&GlobalMid_Lock);
707 list_for_each(tmp, &server->pending_mid_q) {
708 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
709 if (mid_entry->midState == MID_REQUEST_SUBMITTED) {
710 cFYI(1, ("Clearing Mid 0x%x - waking up ",
711 mid_entry->mid));
712 task_to_wake = mid_entry->tsk;
713 if (task_to_wake)
714 wake_up_process(task_to_wake);
715 }
716 }
717 spin_unlock(&GlobalMid_Lock);
718 read_unlock(&cifs_tcp_ses_lock);
719 /* 1/8th of sec is more than enough time for them to exit */
720 msleep(125);
721 }
722
723 if (!list_empty(&server->pending_mid_q)) {
724 /* mpx threads have not exited yet give them
725 at least the smb send timeout time for long ops */
726 /* due to delays on oplock break requests, we need
727 to wait at least 45 seconds before giving up
728 on a request getting a response and going ahead
729 and killing cifsd */
730 cFYI(1, ("Wait for exit from demultiplex thread"));
731 msleep(46000);
732 /* if threads still have not exited they are probably never
733 coming home not much else we can do but free the memory */
734 }
735
736 /* last chance to mark ses pointers invalid
737 if there are any pointing to this (e.g
738 if a crazy root user tried to kill cifsd
739 kernel thread explicitly this might happen) */
740 /* BB: This shouldn't be necessary, see above */
741 read_lock(&cifs_tcp_ses_lock);
742 list_for_each(tmp, &server->smb_ses_list) {
743 ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list);
744 ses->server = NULL;
745 }
746 read_unlock(&cifs_tcp_ses_lock);
747
748 kfree(server->hostname);
749 task_to_wake = xchg(&server->tsk, NULL);
750 kfree(server);
751
752 length = atomic_dec_return(&tcpSesAllocCount);
753 if (length > 0)
754 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
755 GFP_KERNEL);
756
757 /* if server->tsk was NULL then wait for a signal before exiting */
758 if (!task_to_wake) {
759 set_current_state(TASK_INTERRUPTIBLE);
760 while (!signal_pending(current)) {
761 schedule();
762 set_current_state(TASK_INTERRUPTIBLE);
763 }
764 set_current_state(TASK_RUNNING);
765 }
766
767 module_put_and_exit(0);
768 }
769
770 /* extract the host portion of the UNC string */
771 static char *
772 extract_hostname(const char *unc)
773 {
774 const char *src;
775 char *dst, *delim;
776 unsigned int len;
777
778 /* skip double chars at beginning of string */
779 /* BB: check validity of these bytes? */
780 src = unc + 2;
781
782 /* delimiter between hostname and sharename is always '\\' now */
783 delim = strchr(src, '\\');
784 if (!delim)
785 return ERR_PTR(-EINVAL);
786
787 len = delim - src;
788 dst = kmalloc((len + 1), GFP_KERNEL);
789 if (dst == NULL)
790 return ERR_PTR(-ENOMEM);
791
792 memcpy(dst, src, len);
793 dst[len] = '\0';
794
795 return dst;
796 }
797
798 static int
799 cifs_parse_mount_options(char *options, const char *devname,
800 struct smb_vol *vol)
801 {
802 char *value;
803 char *data;
804 unsigned int temp_len, i, j;
805 char separator[2];
806
807 separator[0] = ',';
808 separator[1] = 0;
809
810 if (Local_System_Name[0] != 0)
811 memcpy(vol->source_rfc1001_name, Local_System_Name, 15);
812 else {
813 char *nodename = utsname()->nodename;
814 int n = strnlen(nodename, 15);
815 memset(vol->source_rfc1001_name, 0x20, 15);
816 for (i = 0; i < n; i++) {
817 /* does not have to be perfect mapping since field is
818 informational, only used for servers that do not support
819 port 445 and it can be overridden at mount time */
820 vol->source_rfc1001_name[i] = toupper(nodename[i]);
821 }
822 }
823 vol->source_rfc1001_name[15] = 0;
824 /* null target name indicates to use *SMBSERVR default called name
825 if we end up sending RFC1001 session initialize */
826 vol->target_rfc1001_name[0] = 0;
827 vol->linux_uid = current_uid(); /* use current_euid() instead? */
828 vol->linux_gid = current_gid();
829
830 /* default to only allowing write access to owner of the mount */
831 vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;
832
833 /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
834 /* default is always to request posix paths. */
835 vol->posix_paths = 1;
836 /* default to using server inode numbers where available */
837 vol->server_ino = 1;
838
839 if (!options)
840 return 1;
841
842 if (strncmp(options, "sep=", 4) == 0) {
843 if (options[4] != 0) {
844 separator[0] = options[4];
845 options += 5;
846 } else {
847 cFYI(1, ("Null separator not allowed"));
848 }
849 }
850
851 while ((data = strsep(&options, separator)) != NULL) {
852 if (!*data)
853 continue;
854 if ((value = strchr(data, '=')) != NULL)
855 *value++ = '\0';
856
857 /* Have to parse this before we parse for "user" */
858 if (strnicmp(data, "user_xattr", 10) == 0) {
859 vol->no_xattr = 0;
860 } else if (strnicmp(data, "nouser_xattr", 12) == 0) {
861 vol->no_xattr = 1;
862 } else if (strnicmp(data, "user", 4) == 0) {
863 if (!value) {
864 printk(KERN_WARNING
865 "CIFS: invalid or missing username\n");
866 return 1; /* needs_arg; */
867 } else if (!*value) {
868 /* null user, ie anonymous, authentication */
869 vol->nullauth = 1;
870 }
871 if (strnlen(value, 200) < 200) {
872 vol->username = value;
873 } else {
874 printk(KERN_WARNING "CIFS: username too long\n");
875 return 1;
876 }
877 } else if (strnicmp(data, "pass", 4) == 0) {
878 if (!value) {
879 vol->password = NULL;
880 continue;
881 } else if (value[0] == 0) {
882 /* check if string begins with double comma
883 since that would mean the password really
884 does start with a comma, and would not
885 indicate an empty string */
886 if (value[1] != separator[0]) {
887 vol->password = NULL;
888 continue;
889 }
890 }
891 temp_len = strlen(value);
892 /* removed password length check, NTLM passwords
893 can be arbitrarily long */
894
895 /* if comma in password, the string will be
896 prematurely null terminated. Commas in password are
897 specified across the cifs mount interface by a double
898 comma ie ,, and a comma used as in other cases ie ','
899 as a parameter delimiter/separator is single and due
900 to the strsep above is temporarily zeroed. */
901
902 /* NB: password legally can have multiple commas and
903 the only illegal character in a password is null */
904
905 if ((value[temp_len] == 0) &&
906 (value[temp_len+1] == separator[0])) {
907 /* reinsert comma */
908 value[temp_len] = separator[0];
909 temp_len += 2; /* move after second comma */
910 while (value[temp_len] != 0) {
911 if (value[temp_len] == separator[0]) {
912 if (value[temp_len+1] ==
913 separator[0]) {
914 /* skip second comma */
915 temp_len++;
916 } else {
917 /* single comma indicating start
918 of next parm */
919 break;
920 }
921 }
922 temp_len++;
923 }
924 if (value[temp_len] == 0) {
925 options = NULL;
926 } else {
927 value[temp_len] = 0;
928 /* point option to start of next parm */
929 options = value + temp_len + 1;
930 }
931 /* go from value to value + temp_len condensing
932 double commas to singles. Note that this ends up
933 allocating a few bytes too many, which is ok */
934 vol->password = kzalloc(temp_len, GFP_KERNEL);
935 if (vol->password == NULL) {
936 printk(KERN_WARNING "CIFS: no memory "
937 "for password\n");
938 return 1;
939 }
940 for (i = 0, j = 0; i < temp_len; i++, j++) {
941 vol->password[j] = value[i];
942 if (value[i] == separator[0]
943 && value[i+1] == separator[0]) {
944 /* skip second comma */
945 i++;
946 }
947 }
948 vol->password[j] = 0;
949 } else {
950 vol->password = kzalloc(temp_len+1, GFP_KERNEL);
951 if (vol->password == NULL) {
952 printk(KERN_WARNING "CIFS: no memory "
953 "for password\n");
954 return 1;
955 }
956 strcpy(vol->password, value);
957 }
958 } else if (!strnicmp(data, "ip", 2) ||
959 !strnicmp(data, "addr", 4)) {
960 if (!value || !*value) {
961 vol->UNCip = NULL;
962 } else if (strnlen(value, INET6_ADDRSTRLEN) <
963 INET6_ADDRSTRLEN) {
964 vol->UNCip = value;
965 } else {
966 printk(KERN_WARNING "CIFS: ip address "
967 "too long\n");
968 return 1;
969 }
970 } else if (strnicmp(data, "sec", 3) == 0) {
971 if (!value || !*value) {
972 cERROR(1, ("no security value specified"));
973 continue;
974 } else if (strnicmp(value, "krb5i", 5) == 0) {
975 vol->secFlg |= CIFSSEC_MAY_KRB5 |
976 CIFSSEC_MUST_SIGN;
977 } else if (strnicmp(value, "krb5p", 5) == 0) {
978 /* vol->secFlg |= CIFSSEC_MUST_SEAL |
979 CIFSSEC_MAY_KRB5; */
980 cERROR(1, ("Krb5 cifs privacy not supported"));
981 return 1;
982 } else if (strnicmp(value, "krb5", 4) == 0) {
983 vol->secFlg |= CIFSSEC_MAY_KRB5;
984 #ifdef CONFIG_CIFS_EXPERIMENTAL
985 } else if (strnicmp(value, "ntlmsspi", 8) == 0) {
986 vol->secFlg |= CIFSSEC_MAY_NTLMSSP |
987 CIFSSEC_MUST_SIGN;
988 } else if (strnicmp(value, "ntlmssp", 7) == 0) {
989 vol->secFlg |= CIFSSEC_MAY_NTLMSSP;
990 #endif
991 } else if (strnicmp(value, "ntlmv2i", 7) == 0) {
992 vol->secFlg |= CIFSSEC_MAY_NTLMV2 |
993 CIFSSEC_MUST_SIGN;
994 } else if (strnicmp(value, "ntlmv2", 6) == 0) {
995 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
996 } else if (strnicmp(value, "ntlmi", 5) == 0) {
997 vol->secFlg |= CIFSSEC_MAY_NTLM |
998 CIFSSEC_MUST_SIGN;
999 } else if (strnicmp(value, "ntlm", 4) == 0) {
1000 /* ntlm is default so can be turned off too */
1001 vol->secFlg |= CIFSSEC_MAY_NTLM;
1002 } else if (strnicmp(value, "nontlm", 6) == 0) {
1003 /* BB is there a better way to do this? */
1004 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
1005 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1006 } else if (strnicmp(value, "lanman", 6) == 0) {
1007 vol->secFlg |= CIFSSEC_MAY_LANMAN;
1008 #endif
1009 } else if (strnicmp(value, "none", 4) == 0) {
1010 vol->nullauth = 1;
1011 } else {
1012 cERROR(1, ("bad security option: %s", value));
1013 return 1;
1014 }
1015 } else if ((strnicmp(data, "unc", 3) == 0)
1016 || (strnicmp(data, "target", 6) == 0)
1017 || (strnicmp(data, "path", 4) == 0)) {
1018 if (!value || !*value) {
1019 printk(KERN_WARNING "CIFS: invalid path to "
1020 "network resource\n");
1021 return 1; /* needs_arg; */
1022 }
1023 if ((temp_len = strnlen(value, 300)) < 300) {
1024 vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
1025 if (vol->UNC == NULL)
1026 return 1;
1027 strcpy(vol->UNC, value);
1028 if (strncmp(vol->UNC, "//", 2) == 0) {
1029 vol->UNC[0] = '\\';
1030 vol->UNC[1] = '\\';
1031 } else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
1032 printk(KERN_WARNING
1033 "CIFS: UNC Path does not begin "
1034 "with // or \\\\ \n");
1035 return 1;
1036 }
1037 } else {
1038 printk(KERN_WARNING "CIFS: UNC name too long\n");
1039 return 1;
1040 }
1041 } else if ((strnicmp(data, "domain", 3) == 0)
1042 || (strnicmp(data, "workgroup", 5) == 0)) {
1043 if (!value || !*value) {
1044 printk(KERN_WARNING "CIFS: invalid domain name\n");
1045 return 1; /* needs_arg; */
1046 }
1047 /* BB are there cases in which a comma can be valid in
1048 a domain name and need special handling? */
1049 if (strnlen(value, 256) < 256) {
1050 vol->domainname = value;
1051 cFYI(1, ("Domain name set"));
1052 } else {
1053 printk(KERN_WARNING "CIFS: domain name too "
1054 "long\n");
1055 return 1;
1056 }
1057 } else if (strnicmp(data, "prefixpath", 10) == 0) {
1058 if (!value || !*value) {
1059 printk(KERN_WARNING
1060 "CIFS: invalid path prefix\n");
1061 return 1; /* needs_argument */
1062 }
1063 if ((temp_len = strnlen(value, 1024)) < 1024) {
1064 if (value[0] != '/')
1065 temp_len++; /* missing leading slash */
1066 vol->prepath = kmalloc(temp_len+1, GFP_KERNEL);
1067 if (vol->prepath == NULL)
1068 return 1;
1069 if (value[0] != '/') {
1070 vol->prepath[0] = '/';
1071 strcpy(vol->prepath+1, value);
1072 } else
1073 strcpy(vol->prepath, value);
1074 cFYI(1, ("prefix path %s", vol->prepath));
1075 } else {
1076 printk(KERN_WARNING "CIFS: prefix too long\n");
1077 return 1;
1078 }
1079 } else if (strnicmp(data, "iocharset", 9) == 0) {
1080 if (!value || !*value) {
1081 printk(KERN_WARNING "CIFS: invalid iocharset "
1082 "specified\n");
1083 return 1; /* needs_arg; */
1084 }
1085 if (strnlen(value, 65) < 65) {
1086 if (strnicmp(value, "default", 7))
1087 vol->iocharset = value;
1088 /* if iocharset not set then load_nls_default
1089 is used by caller */
1090 cFYI(1, ("iocharset set to %s", value));
1091 } else {
1092 printk(KERN_WARNING "CIFS: iocharset name "
1093 "too long.\n");
1094 return 1;
1095 }
1096 } else if (strnicmp(data, "uid", 3) == 0) {
1097 if (value && *value)
1098 vol->linux_uid =
1099 simple_strtoul(value, &value, 0);
1100 } else if (strnicmp(data, "forceuid", 8) == 0) {
1101 vol->override_uid = 1;
1102 } else if (strnicmp(data, "gid", 3) == 0) {
1103 if (value && *value)
1104 vol->linux_gid =
1105 simple_strtoul(value, &value, 0);
1106 } else if (strnicmp(data, "forcegid", 8) == 0) {
1107 vol->override_gid = 1;
1108 } else if (strnicmp(data, "file_mode", 4) == 0) {
1109 if (value && *value) {
1110 vol->file_mode =
1111 simple_strtoul(value, &value, 0);
1112 }
1113 } else if (strnicmp(data, "dir_mode", 4) == 0) {
1114 if (value && *value) {
1115 vol->dir_mode =
1116 simple_strtoul(value, &value, 0);
1117 }
1118 } else if (strnicmp(data, "dirmode", 4) == 0) {
1119 if (value && *value) {
1120 vol->dir_mode =
1121 simple_strtoul(value, &value, 0);
1122 }
1123 } else if (strnicmp(data, "port", 4) == 0) {
1124 if (value && *value) {
1125 vol->port =
1126 simple_strtoul(value, &value, 0);
1127 }
1128 } else if (strnicmp(data, "rsize", 5) == 0) {
1129 if (value && *value) {
1130 vol->rsize =
1131 simple_strtoul(value, &value, 0);
1132 }
1133 } else if (strnicmp(data, "wsize", 5) == 0) {
1134 if (value && *value) {
1135 vol->wsize =
1136 simple_strtoul(value, &value, 0);
1137 }
1138 } else if (strnicmp(data, "sockopt", 5) == 0) {
1139 if (value && *value) {
1140 vol->sockopt =
1141 simple_strtoul(value, &value, 0);
1142 }
1143 } else if (strnicmp(data, "netbiosname", 4) == 0) {
1144 if (!value || !*value || (*value == ' ')) {
1145 cFYI(1, ("invalid (empty) netbiosname"));
1146 } else {
1147 memset(vol->source_rfc1001_name, 0x20, 15);
1148 for (i = 0; i < 15; i++) {
1149 /* BB are there cases in which a comma can be
1150 valid in this workstation netbios name (and need
1151 special handling)? */
1152
1153 /* We do not uppercase netbiosname for user */
1154 if (value[i] == 0)
1155 break;
1156 else
1157 vol->source_rfc1001_name[i] =
1158 value[i];
1159 }
1160 /* The string has 16th byte zero still from
1161 set at top of the function */
1162 if ((i == 15) && (value[i] != 0))
1163 printk(KERN_WARNING "CIFS: netbiosname"
1164 " longer than 15 truncated.\n");
1165 }
1166 } else if (strnicmp(data, "servern", 7) == 0) {
1167 /* servernetbiosname specified override *SMBSERVER */
1168 if (!value || !*value || (*value == ' ')) {
1169 cFYI(1, ("empty server netbiosname specified"));
1170 } else {
1171 /* last byte, type, is 0x20 for servr type */
1172 memset(vol->target_rfc1001_name, 0x20, 16);
1173
1174 for (i = 0; i < 15; i++) {
1175 /* BB are there cases in which a comma can be
1176 valid in this workstation netbios name
1177 (and need special handling)? */
1178
1179 /* user or mount helper must uppercase
1180 the netbiosname */
1181 if (value[i] == 0)
1182 break;
1183 else
1184 vol->target_rfc1001_name[i] =
1185 value[i];
1186 }
1187 /* The string has 16th byte zero still from
1188 set at top of the function */
1189 if ((i == 15) && (value[i] != 0))
1190 printk(KERN_WARNING "CIFS: server net"
1191 "biosname longer than 15 truncated.\n");
1192 }
1193 } else if (strnicmp(data, "credentials", 4) == 0) {
1194 /* ignore */
1195 } else if (strnicmp(data, "version", 3) == 0) {
1196 /* ignore */
1197 } else if (strnicmp(data, "guest", 5) == 0) {
1198 /* ignore */
1199 } else if (strnicmp(data, "noblocksend", 11) == 0) {
1200 vol->noblocksnd = 1;
1201 } else if (strnicmp(data, "noautotune", 10) == 0) {
1202 vol->noautotune = 1;
1203 } else if ((strnicmp(data, "suid", 4) == 0) ||
1204 (strnicmp(data, "nosuid", 6) == 0) ||
1205 (strnicmp(data, "exec", 4) == 0) ||
1206 (strnicmp(data, "noexec", 6) == 0) ||
1207 (strnicmp(data, "nodev", 5) == 0) ||
1208 (strnicmp(data, "noauto", 6) == 0) ||
1209 (strnicmp(data, "dev", 3) == 0)) {
1210 /* The mount tool or mount.cifs helper (if present)
1211 uses these opts to set flags, and the flags are read
1212 by the kernel vfs layer before we get here (ie
1213 before read super) so there is no point trying to
1214 parse these options again and set anything and it
1215 is ok to just ignore them */
1216 continue;
1217 } else if (strnicmp(data, "hard", 4) == 0) {
1218 vol->retry = 1;
1219 } else if (strnicmp(data, "soft", 4) == 0) {
1220 vol->retry = 0;
1221 } else if (strnicmp(data, "perm", 4) == 0) {
1222 vol->noperm = 0;
1223 } else if (strnicmp(data, "noperm", 6) == 0) {
1224 vol->noperm = 1;
1225 } else if (strnicmp(data, "mapchars", 8) == 0) {
1226 vol->remap = 1;
1227 } else if (strnicmp(data, "nomapchars", 10) == 0) {
1228 vol->remap = 0;
1229 } else if (strnicmp(data, "sfu", 3) == 0) {
1230 vol->sfu_emul = 1;
1231 } else if (strnicmp(data, "nosfu", 5) == 0) {
1232 vol->sfu_emul = 0;
1233 } else if (strnicmp(data, "nodfs", 5) == 0) {
1234 vol->nodfs = 1;
1235 } else if (strnicmp(data, "posixpaths", 10) == 0) {
1236 vol->posix_paths = 1;
1237 } else if (strnicmp(data, "noposixpaths", 12) == 0) {
1238 vol->posix_paths = 0;
1239 } else if (strnicmp(data, "nounix", 6) == 0) {
1240 vol->no_linux_ext = 1;
1241 } else if (strnicmp(data, "nolinux", 7) == 0) {
1242 vol->no_linux_ext = 1;
1243 } else if ((strnicmp(data, "nocase", 6) == 0) ||
1244 (strnicmp(data, "ignorecase", 10) == 0)) {
1245 vol->nocase = 1;
1246 } else if (strnicmp(data, "brl", 3) == 0) {
1247 vol->nobrl = 0;
1248 } else if ((strnicmp(data, "nobrl", 5) == 0) ||
1249 (strnicmp(data, "nolock", 6) == 0)) {
1250 vol->nobrl = 1;
1251 /* turn off mandatory locking in mode
1252 if remote locking is turned off since the
1253 local vfs will do advisory */
1254 if (vol->file_mode ==
1255 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
1256 vol->file_mode = S_IALLUGO;
1257 } else if (strnicmp(data, "forcemandatorylock", 9) == 0) {
1258 /* will take the shorter form "forcemand" as well */
1259 /* This mount option will force use of mandatory
1260 (DOS/Windows style) byte range locks, instead of
1261 using posix advisory byte range locks, even if the
1262 Unix extensions are available and posix locks would
1263 be supported otherwise. If Unix extensions are not
1264 negotiated this has no effect since mandatory locks
1265 would be used (mandatory locks is all that those
1266 those servers support) */
1267 vol->mand_lock = 1;
1268 } else if (strnicmp(data, "setuids", 7) == 0) {
1269 vol->setuids = 1;
1270 } else if (strnicmp(data, "nosetuids", 9) == 0) {
1271 vol->setuids = 0;
1272 } else if (strnicmp(data, "dynperm", 7) == 0) {
1273 vol->dynperm = true;
1274 } else if (strnicmp(data, "nodynperm", 9) == 0) {
1275 vol->dynperm = false;
1276 } else if (strnicmp(data, "nohard", 6) == 0) {
1277 vol->retry = 0;
1278 } else if (strnicmp(data, "nosoft", 6) == 0) {
1279 vol->retry = 1;
1280 } else if (strnicmp(data, "nointr", 6) == 0) {
1281 vol->intr = 0;
1282 } else if (strnicmp(data, "intr", 4) == 0) {
1283 vol->intr = 1;
1284 } else if (strnicmp(data, "nostrictsync", 12) == 0) {
1285 vol->nostrictsync = 1;
1286 } else if (strnicmp(data, "strictsync", 10) == 0) {
1287 vol->nostrictsync = 0;
1288 } else if (strnicmp(data, "serverino", 7) == 0) {
1289 vol->server_ino = 1;
1290 } else if (strnicmp(data, "noserverino", 9) == 0) {
1291 vol->server_ino = 0;
1292 } else if (strnicmp(data, "cifsacl", 7) == 0) {
1293 vol->cifs_acl = 1;
1294 } else if (strnicmp(data, "nocifsacl", 9) == 0) {
1295 vol->cifs_acl = 0;
1296 } else if (strnicmp(data, "acl", 3) == 0) {
1297 vol->no_psx_acl = 0;
1298 } else if (strnicmp(data, "noacl", 5) == 0) {
1299 vol->no_psx_acl = 1;
1300 #ifdef CONFIG_CIFS_EXPERIMENTAL
1301 } else if (strnicmp(data, "locallease", 6) == 0) {
1302 vol->local_lease = 1;
1303 #endif
1304 } else if (strnicmp(data, "sign", 4) == 0) {
1305 vol->secFlg |= CIFSSEC_MUST_SIGN;
1306 } else if (strnicmp(data, "seal", 4) == 0) {
1307 /* we do not do the following in secFlags because seal
1308 is a per tree connection (mount) not a per socket
1309 or per-smb connection option in the protocol */
1310 /* vol->secFlg |= CIFSSEC_MUST_SEAL; */
1311 vol->seal = 1;
1312 } else if (strnicmp(data, "direct", 6) == 0) {
1313 vol->direct_io = 1;
1314 } else if (strnicmp(data, "forcedirectio", 13) == 0) {
1315 vol->direct_io = 1;
1316 } else if (strnicmp(data, "noac", 4) == 0) {
1317 printk(KERN_WARNING "CIFS: Mount option noac not "
1318 "supported. Instead set "
1319 "/proc/fs/cifs/LookupCacheEnabled to 0\n");
1320 } else
1321 printk(KERN_WARNING "CIFS: Unknown mount option %s\n",
1322 data);
1323 }
1324 if (vol->UNC == NULL) {
1325 if (devname == NULL) {
1326 printk(KERN_WARNING "CIFS: Missing UNC name for mount "
1327 "target\n");
1328 return 1;
1329 }
1330 if ((temp_len = strnlen(devname, 300)) < 300) {
1331 vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
1332 if (vol->UNC == NULL)
1333 return 1;
1334 strcpy(vol->UNC, devname);
1335 if (strncmp(vol->UNC, "//", 2) == 0) {
1336 vol->UNC[0] = '\\';
1337 vol->UNC[1] = '\\';
1338 } else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
1339 printk(KERN_WARNING "CIFS: UNC Path does not "
1340 "begin with // or \\\\ \n");
1341 return 1;
1342 }
1343 value = strpbrk(vol->UNC+2, "/\\");
1344 if (value)
1345 *value = '\\';
1346 } else {
1347 printk(KERN_WARNING "CIFS: UNC name too long\n");
1348 return 1;
1349 }
1350 }
1351 if (vol->UNCip == NULL)
1352 vol->UNCip = &vol->UNC[2];
1353
1354 return 0;
1355 }
1356
1357 static struct TCP_Server_Info *
1358 cifs_find_tcp_session(struct sockaddr_storage *addr)
1359 {
1360 struct list_head *tmp;
1361 struct TCP_Server_Info *server;
1362 struct sockaddr_in *addr4 = (struct sockaddr_in *) addr;
1363 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *) addr;
1364
1365 write_lock(&cifs_tcp_ses_lock);
1366 list_for_each(tmp, &cifs_tcp_ses_list) {
1367 server = list_entry(tmp, struct TCP_Server_Info,
1368 tcp_ses_list);
1369 /*
1370 * the demux thread can exit on its own while still in CifsNew
1371 * so don't accept any sockets in that state. Since the
1372 * tcpStatus never changes back to CifsNew it's safe to check
1373 * for this without a lock.
1374 */
1375 if (server->tcpStatus == CifsNew)
1376 continue;
1377
1378 if (addr->ss_family == AF_INET &&
1379 (addr4->sin_addr.s_addr !=
1380 server->addr.sockAddr.sin_addr.s_addr))
1381 continue;
1382 else if (addr->ss_family == AF_INET6 &&
1383 (!ipv6_addr_equal(&server->addr.sockAddr6.sin6_addr,
1384 &addr6->sin6_addr) ||
1385 server->addr.sockAddr6.sin6_scope_id !=
1386 addr6->sin6_scope_id))
1387 continue;
1388
1389 ++server->srv_count;
1390 write_unlock(&cifs_tcp_ses_lock);
1391 cFYI(1, ("Existing tcp session with server found"));
1392 return server;
1393 }
1394 write_unlock(&cifs_tcp_ses_lock);
1395 return NULL;
1396 }
1397
1398 static void
1399 cifs_put_tcp_session(struct TCP_Server_Info *server)
1400 {
1401 struct task_struct *task;
1402
1403 write_lock(&cifs_tcp_ses_lock);
1404 if (--server->srv_count > 0) {
1405 write_unlock(&cifs_tcp_ses_lock);
1406 return;
1407 }
1408
1409 list_del_init(&server->tcp_ses_list);
1410 write_unlock(&cifs_tcp_ses_lock);
1411
1412 spin_lock(&GlobalMid_Lock);
1413 server->tcpStatus = CifsExiting;
1414 spin_unlock(&GlobalMid_Lock);
1415
1416 task = xchg(&server->tsk, NULL);
1417 if (task)
1418 force_sig(SIGKILL, task);
1419 }
1420
1421 static struct TCP_Server_Info *
1422 cifs_get_tcp_session(struct smb_vol *volume_info)
1423 {
1424 struct TCP_Server_Info *tcp_ses = NULL;
1425 struct sockaddr_storage addr;
1426 struct sockaddr_in *sin_server = (struct sockaddr_in *) &addr;
1427 struct sockaddr_in6 *sin_server6 = (struct sockaddr_in6 *) &addr;
1428 int rc;
1429
1430 memset(&addr, 0, sizeof(struct sockaddr_storage));
1431
1432 cFYI(1, ("UNC: %s ip: %s", volume_info->UNC, volume_info->UNCip));
1433
1434 if (volume_info->UNCip && volume_info->UNC) {
1435 rc = cifs_convert_address(volume_info->UNCip, &addr);
1436 if (!rc) {
1437 /* we failed translating address */
1438 rc = -EINVAL;
1439 goto out_err;
1440 }
1441 } else if (volume_info->UNCip) {
1442 /* BB using ip addr as tcp_ses name to connect to the
1443 DFS root below */
1444 cERROR(1, ("Connecting to DFS root not implemented yet"));
1445 rc = -EINVAL;
1446 goto out_err;
1447 } else /* which tcp_sess DFS root would we conect to */ {
1448 cERROR(1,
1449 ("CIFS mount error: No UNC path (e.g. -o "
1450 "unc=//192.168.1.100/public) specified"));
1451 rc = -EINVAL;
1452 goto out_err;
1453 }
1454
1455 /* see if we already have a matching tcp_ses */
1456 tcp_ses = cifs_find_tcp_session(&addr);
1457 if (tcp_ses)
1458 return tcp_ses;
1459
1460 tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
1461 if (!tcp_ses) {
1462 rc = -ENOMEM;
1463 goto out_err;
1464 }
1465
1466 tcp_ses->hostname = extract_hostname(volume_info->UNC);
1467 if (IS_ERR(tcp_ses->hostname)) {
1468 rc = PTR_ERR(tcp_ses->hostname);
1469 goto out_err;
1470 }
1471
1472 tcp_ses->noblocksnd = volume_info->noblocksnd;
1473 tcp_ses->noautotune = volume_info->noautotune;
1474 atomic_set(&tcp_ses->inFlight, 0);
1475 init_waitqueue_head(&tcp_ses->response_q);
1476 init_waitqueue_head(&tcp_ses->request_q);
1477 INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
1478 mutex_init(&tcp_ses->srv_mutex);
1479 memcpy(tcp_ses->workstation_RFC1001_name,
1480 volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1481 memcpy(tcp_ses->server_RFC1001_name,
1482 volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1483 tcp_ses->sequence_number = 0;
1484 INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
1485 INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
1486
1487 /*
1488 * at this point we are the only ones with the pointer
1489 * to the struct since the kernel thread not created yet
1490 * no need to spinlock this init of tcpStatus or srv_count
1491 */
1492 tcp_ses->tcpStatus = CifsNew;
1493 ++tcp_ses->srv_count;
1494
1495 if (addr.ss_family == AF_INET6) {
1496 cFYI(1, ("attempting ipv6 connect"));
1497 /* BB should we allow ipv6 on port 139? */
1498 /* other OS never observed in Wild doing 139 with v6 */
1499 sin_server6->sin6_port = htons(volume_info->port);
1500 memcpy(&tcp_ses->addr.sockAddr6, sin_server6,
1501 sizeof(struct sockaddr_in6));
1502 rc = ipv6_connect(tcp_ses);
1503 } else {
1504 sin_server->sin_port = htons(volume_info->port);
1505 memcpy(&tcp_ses->addr.sockAddr, sin_server,
1506 sizeof(struct sockaddr_in));
1507 rc = ipv4_connect(tcp_ses);
1508 }
1509 if (rc < 0) {
1510 cERROR(1, ("Error connecting to socket. Aborting operation"));
1511 goto out_err;
1512 }
1513
1514 /*
1515 * since we're in a cifs function already, we know that
1516 * this will succeed. No need for try_module_get().
1517 */
1518 __module_get(THIS_MODULE);
1519 tcp_ses->tsk = kthread_run((void *)(void *)cifs_demultiplex_thread,
1520 tcp_ses, "cifsd");
1521 if (IS_ERR(tcp_ses->tsk)) {
1522 rc = PTR_ERR(tcp_ses->tsk);
1523 cERROR(1, ("error %d create cifsd thread", rc));
1524 module_put(THIS_MODULE);
1525 goto out_err;
1526 }
1527
1528 /* thread spawned, put it on the list */
1529 write_lock(&cifs_tcp_ses_lock);
1530 list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
1531 write_unlock(&cifs_tcp_ses_lock);
1532
1533 return tcp_ses;
1534
1535 out_err:
1536 if (tcp_ses) {
1537 kfree(tcp_ses->hostname);
1538 if (tcp_ses->ssocket)
1539 sock_release(tcp_ses->ssocket);
1540 kfree(tcp_ses);
1541 }
1542 return ERR_PTR(rc);
1543 }
1544
1545 static struct cifsSesInfo *
1546 cifs_find_smb_ses(struct TCP_Server_Info *server, char *username)
1547 {
1548 struct list_head *tmp;
1549 struct cifsSesInfo *ses;
1550
1551 write_lock(&cifs_tcp_ses_lock);
1552 list_for_each(tmp, &server->smb_ses_list) {
1553 ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list);
1554 if (strncmp(ses->userName, username, MAX_USERNAME_SIZE))
1555 continue;
1556
1557 ++ses->ses_count;
1558 write_unlock(&cifs_tcp_ses_lock);
1559 return ses;
1560 }
1561 write_unlock(&cifs_tcp_ses_lock);
1562 return NULL;
1563 }
1564
1565 static void
1566 cifs_put_smb_ses(struct cifsSesInfo *ses)
1567 {
1568 int xid;
1569 struct TCP_Server_Info *server = ses->server;
1570
1571 write_lock(&cifs_tcp_ses_lock);
1572 if (--ses->ses_count > 0) {
1573 write_unlock(&cifs_tcp_ses_lock);
1574 return;
1575 }
1576
1577 list_del_init(&ses->smb_ses_list);
1578 write_unlock(&cifs_tcp_ses_lock);
1579
1580 if (ses->status == CifsGood) {
1581 xid = GetXid();
1582 CIFSSMBLogoff(xid, ses);
1583 _FreeXid(xid);
1584 }
1585 sesInfoFree(ses);
1586 cifs_put_tcp_session(server);
1587 }
1588
1589 static struct cifsTconInfo *
1590 cifs_find_tcon(struct cifsSesInfo *ses, const char *unc)
1591 {
1592 struct list_head *tmp;
1593 struct cifsTconInfo *tcon;
1594
1595 write_lock(&cifs_tcp_ses_lock);
1596 list_for_each(tmp, &ses->tcon_list) {
1597 tcon = list_entry(tmp, struct cifsTconInfo, tcon_list);
1598 if (tcon->tidStatus == CifsExiting)
1599 continue;
1600 if (strncmp(tcon->treeName, unc, MAX_TREE_SIZE))
1601 continue;
1602
1603 ++tcon->tc_count;
1604 write_unlock(&cifs_tcp_ses_lock);
1605 return tcon;
1606 }
1607 write_unlock(&cifs_tcp_ses_lock);
1608 return NULL;
1609 }
1610
1611 static void
1612 cifs_put_tcon(struct cifsTconInfo *tcon)
1613 {
1614 int xid;
1615 struct cifsSesInfo *ses = tcon->ses;
1616
1617 write_lock(&cifs_tcp_ses_lock);
1618 if (--tcon->tc_count > 0) {
1619 write_unlock(&cifs_tcp_ses_lock);
1620 return;
1621 }
1622
1623 list_del_init(&tcon->tcon_list);
1624 write_unlock(&cifs_tcp_ses_lock);
1625
1626 xid = GetXid();
1627 CIFSSMBTDis(xid, tcon);
1628 _FreeXid(xid);
1629
1630 DeleteTconOplockQEntries(tcon);
1631 tconInfoFree(tcon);
1632 cifs_put_smb_ses(ses);
1633 }
1634
1635 int
1636 get_dfs_path(int xid, struct cifsSesInfo *pSesInfo, const char *old_path,
1637 const struct nls_table *nls_codepage, unsigned int *pnum_referrals,
1638 struct dfs_info3_param **preferrals, int remap)
1639 {
1640 char *temp_unc;
1641 int rc = 0;
1642
1643 *pnum_referrals = 0;
1644 *preferrals = NULL;
1645
1646 if (pSesInfo->ipc_tid == 0) {
1647 temp_unc = kmalloc(2 /* for slashes */ +
1648 strnlen(pSesInfo->serverName,
1649 SERVER_NAME_LEN_WITH_NULL * 2)
1650 + 1 + 4 /* slash IPC$ */ + 2,
1651 GFP_KERNEL);
1652 if (temp_unc == NULL)
1653 return -ENOMEM;
1654 temp_unc[0] = '\\';
1655 temp_unc[1] = '\\';
1656 strcpy(temp_unc + 2, pSesInfo->serverName);
1657 strcpy(temp_unc + 2 + strlen(pSesInfo->serverName), "\\IPC$");
1658 rc = CIFSTCon(xid, pSesInfo, temp_unc, NULL, nls_codepage);
1659 cFYI(1,
1660 ("CIFS Tcon rc = %d ipc_tid = %d", rc, pSesInfo->ipc_tid));
1661 kfree(temp_unc);
1662 }
1663 if (rc == 0)
1664 rc = CIFSGetDFSRefer(xid, pSesInfo, old_path, preferrals,
1665 pnum_referrals, nls_codepage, remap);
1666 /* BB map targetUNCs to dfs_info3 structures, here or
1667 in CIFSGetDFSRefer BB */
1668
1669 return rc;
1670 }
1671
1672 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1673 static struct lock_class_key cifs_key[2];
1674 static struct lock_class_key cifs_slock_key[2];
1675
1676 static inline void
1677 cifs_reclassify_socket4(struct socket *sock)
1678 {
1679 struct sock *sk = sock->sk;
1680 BUG_ON(sock_owned_by_user(sk));
1681 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
1682 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
1683 }
1684
1685 static inline void
1686 cifs_reclassify_socket6(struct socket *sock)
1687 {
1688 struct sock *sk = sock->sk;
1689 BUG_ON(sock_owned_by_user(sk));
1690 sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
1691 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
1692 }
1693 #else
1694 static inline void
1695 cifs_reclassify_socket4(struct socket *sock)
1696 {
1697 }
1698
1699 static inline void
1700 cifs_reclassify_socket6(struct socket *sock)
1701 {
1702 }
1703 #endif
1704
1705 /* See RFC1001 section 14 on representation of Netbios names */
1706 static void rfc1002mangle(char *target, char *source, unsigned int length)
1707 {
1708 unsigned int i, j;
1709
1710 for (i = 0, j = 0; i < (length); i++) {
1711 /* mask a nibble at a time and encode */
1712 target[j] = 'A' + (0x0F & (source[i] >> 4));
1713 target[j+1] = 'A' + (0x0F & source[i]);
1714 j += 2;
1715 }
1716
1717 }
1718
1719
1720 static int
1721 ipv4_connect(struct TCP_Server_Info *server)
1722 {
1723 int rc = 0;
1724 bool connected = false;
1725 __be16 orig_port = 0;
1726 struct socket *socket = server->ssocket;
1727
1728 if (socket == NULL) {
1729 rc = sock_create_kern(PF_INET, SOCK_STREAM,
1730 IPPROTO_TCP, &socket);
1731 if (rc < 0) {
1732 cERROR(1, ("Error %d creating socket", rc));
1733 return rc;
1734 }
1735
1736 /* BB other socket options to set KEEPALIVE, NODELAY? */
1737 cFYI(1, ("Socket created"));
1738 server->ssocket = socket;
1739 socket->sk->sk_allocation = GFP_NOFS;
1740 cifs_reclassify_socket4(socket);
1741 }
1742
1743 /* user overrode default port */
1744 if (server->addr.sockAddr.sin_port) {
1745 rc = socket->ops->connect(socket, (struct sockaddr *)
1746 &server->addr.sockAddr,
1747 sizeof(struct sockaddr_in), 0);
1748 if (rc >= 0)
1749 connected = true;
1750 }
1751
1752 if (!connected) {
1753 /* save original port so we can retry user specified port
1754 later if fall back ports fail this time */
1755 orig_port = server->addr.sockAddr.sin_port;
1756
1757 /* do not retry on the same port we just failed on */
1758 if (server->addr.sockAddr.sin_port != htons(CIFS_PORT)) {
1759 server->addr.sockAddr.sin_port = htons(CIFS_PORT);
1760 rc = socket->ops->connect(socket,
1761 (struct sockaddr *)
1762 &server->addr.sockAddr,
1763 sizeof(struct sockaddr_in), 0);
1764 if (rc >= 0)
1765 connected = true;
1766 }
1767 }
1768 if (!connected) {
1769 server->addr.sockAddr.sin_port = htons(RFC1001_PORT);
1770 rc = socket->ops->connect(socket, (struct sockaddr *)
1771 &server->addr.sockAddr,
1772 sizeof(struct sockaddr_in), 0);
1773 if (rc >= 0)
1774 connected = true;
1775 }
1776
1777 /* give up here - unless we want to retry on different
1778 protocol families some day */
1779 if (!connected) {
1780 if (orig_port)
1781 server->addr.sockAddr.sin_port = orig_port;
1782 cFYI(1, ("Error %d connecting to server via ipv4", rc));
1783 sock_release(socket);
1784 server->ssocket = NULL;
1785 return rc;
1786 }
1787
1788
1789 /*
1790 * Eventually check for other socket options to change from
1791 * the default. sock_setsockopt not used because it expects
1792 * user space buffer
1793 */
1794 socket->sk->sk_rcvtimeo = 7 * HZ;
1795 socket->sk->sk_sndtimeo = 5 * HZ;
1796
1797 /* make the bufsizes depend on wsize/rsize and max requests */
1798 if (server->noautotune) {
1799 if (socket->sk->sk_sndbuf < (200 * 1024))
1800 socket->sk->sk_sndbuf = 200 * 1024;
1801 if (socket->sk->sk_rcvbuf < (140 * 1024))
1802 socket->sk->sk_rcvbuf = 140 * 1024;
1803 }
1804
1805 cFYI(1, ("sndbuf %d rcvbuf %d rcvtimeo 0x%lx",
1806 socket->sk->sk_sndbuf,
1807 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo));
1808
1809 /* send RFC1001 sessinit */
1810 if (server->addr.sockAddr.sin_port == htons(RFC1001_PORT)) {
1811 /* some servers require RFC1001 sessinit before sending
1812 negprot - BB check reconnection in case where second
1813 sessinit is sent but no second negprot */
1814 struct rfc1002_session_packet *ses_init_buf;
1815 struct smb_hdr *smb_buf;
1816 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
1817 GFP_KERNEL);
1818 if (ses_init_buf) {
1819 ses_init_buf->trailer.session_req.called_len = 32;
1820 if (server->server_RFC1001_name &&
1821 server->server_RFC1001_name[0] != 0)
1822 rfc1002mangle(ses_init_buf->trailer.
1823 session_req.called_name,
1824 server->server_RFC1001_name,
1825 RFC1001_NAME_LEN_WITH_NULL);
1826 else
1827 rfc1002mangle(ses_init_buf->trailer.
1828 session_req.called_name,
1829 DEFAULT_CIFS_CALLED_NAME,
1830 RFC1001_NAME_LEN_WITH_NULL);
1831
1832 ses_init_buf->trailer.session_req.calling_len = 32;
1833
1834 /* calling name ends in null (byte 16) from old smb
1835 convention. */
1836 if (server->workstation_RFC1001_name &&
1837 server->workstation_RFC1001_name[0] != 0)
1838 rfc1002mangle(ses_init_buf->trailer.
1839 session_req.calling_name,
1840 server->workstation_RFC1001_name,
1841 RFC1001_NAME_LEN_WITH_NULL);
1842 else
1843 rfc1002mangle(ses_init_buf->trailer.
1844 session_req.calling_name,
1845 "LINUX_CIFS_CLNT",
1846 RFC1001_NAME_LEN_WITH_NULL);
1847
1848 ses_init_buf->trailer.session_req.scope1 = 0;
1849 ses_init_buf->trailer.session_req.scope2 = 0;
1850 smb_buf = (struct smb_hdr *)ses_init_buf;
1851 /* sizeof RFC1002_SESSION_REQUEST with no scope */
1852 smb_buf->smb_buf_length = 0x81000044;
1853 rc = smb_send(server, smb_buf, 0x44);
1854 kfree(ses_init_buf);
1855 msleep(1); /* RFC1001 layer in at least one server
1856 requires very short break before negprot
1857 presumably because not expecting negprot
1858 to follow so fast. This is a simple
1859 solution that works without
1860 complicating the code and causes no
1861 significant slowing down on mount
1862 for everyone else */
1863 }
1864 /* else the negprot may still work without this
1865 even though malloc failed */
1866
1867 }
1868
1869 return rc;
1870 }
1871
1872 static int
1873 ipv6_connect(struct TCP_Server_Info *server)
1874 {
1875 int rc = 0;
1876 bool connected = false;
1877 __be16 orig_port = 0;
1878 struct socket *socket = server->ssocket;
1879
1880 if (socket == NULL) {
1881 rc = sock_create_kern(PF_INET6, SOCK_STREAM,
1882 IPPROTO_TCP, &socket);
1883 if (rc < 0) {
1884 cERROR(1, ("Error %d creating ipv6 socket", rc));
1885 socket = NULL;
1886 return rc;
1887 }
1888
1889 /* BB other socket options to set KEEPALIVE, NODELAY? */
1890 cFYI(1, ("ipv6 Socket created"));
1891 server->ssocket = socket;
1892 socket->sk->sk_allocation = GFP_NOFS;
1893 cifs_reclassify_socket6(socket);
1894 }
1895
1896 /* user overrode default port */
1897 if (server->addr.sockAddr6.sin6_port) {
1898 rc = socket->ops->connect(socket,
1899 (struct sockaddr *) &server->addr.sockAddr6,
1900 sizeof(struct sockaddr_in6), 0);
1901 if (rc >= 0)
1902 connected = true;
1903 }
1904
1905 if (!connected) {
1906 /* save original port so we can retry user specified port
1907 later if fall back ports fail this time */
1908
1909 orig_port = server->addr.sockAddr6.sin6_port;
1910 /* do not retry on the same port we just failed on */
1911 if (server->addr.sockAddr6.sin6_port != htons(CIFS_PORT)) {
1912 server->addr.sockAddr6.sin6_port = htons(CIFS_PORT);
1913 rc = socket->ops->connect(socket, (struct sockaddr *)
1914 &server->addr.sockAddr6,
1915 sizeof(struct sockaddr_in6), 0);
1916 if (rc >= 0)
1917 connected = true;
1918 }
1919 }
1920 if (!connected) {
1921 server->addr.sockAddr6.sin6_port = htons(RFC1001_PORT);
1922 rc = socket->ops->connect(socket, (struct sockaddr *)
1923 &server->addr.sockAddr6,
1924 sizeof(struct sockaddr_in6), 0);
1925 if (rc >= 0)
1926 connected = true;
1927 }
1928
1929 /* give up here - unless we want to retry on different
1930 protocol families some day */
1931 if (!connected) {
1932 if (orig_port)
1933 server->addr.sockAddr6.sin6_port = orig_port;
1934 cFYI(1, ("Error %d connecting to server via ipv6", rc));
1935 sock_release(socket);
1936 server->ssocket = NULL;
1937 return rc;
1938 }
1939
1940 /*
1941 * Eventually check for other socket options to change from
1942 * the default. sock_setsockopt not used because it expects
1943 * user space buffer
1944 */
1945 socket->sk->sk_rcvtimeo = 7 * HZ;
1946 socket->sk->sk_sndtimeo = 5 * HZ;
1947 server->ssocket = socket;
1948
1949 return rc;
1950 }
1951
1952 void reset_cifs_unix_caps(int xid, struct cifsTconInfo *tcon,
1953 struct super_block *sb, struct smb_vol *vol_info)
1954 {
1955 /* if we are reconnecting then should we check to see if
1956 * any requested capabilities changed locally e.g. via
1957 * remount but we can not do much about it here
1958 * if they have (even if we could detect it by the following)
1959 * Perhaps we could add a backpointer to array of sb from tcon
1960 * or if we change to make all sb to same share the same
1961 * sb as NFS - then we only have one backpointer to sb.
1962 * What if we wanted to mount the server share twice once with
1963 * and once without posixacls or posix paths? */
1964 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
1965
1966 if (vol_info && vol_info->no_linux_ext) {
1967 tcon->fsUnixInfo.Capability = 0;
1968 tcon->unix_ext = 0; /* Unix Extensions disabled */
1969 cFYI(1, ("Linux protocol extensions disabled"));
1970 return;
1971 } else if (vol_info)
1972 tcon->unix_ext = 1; /* Unix Extensions supported */
1973
1974 if (tcon->unix_ext == 0) {
1975 cFYI(1, ("Unix extensions disabled so not set on reconnect"));
1976 return;
1977 }
1978
1979 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
1980 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
1981
1982 /* check for reconnect case in which we do not
1983 want to change the mount behavior if we can avoid it */
1984 if (vol_info == NULL) {
1985 /* turn off POSIX ACL and PATHNAMES if not set
1986 originally at mount time */
1987 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
1988 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
1989 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
1990 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
1991 cERROR(1, ("POSIXPATH support change"));
1992 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
1993 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
1994 cERROR(1, ("possible reconnect error"));
1995 cERROR(1,
1996 ("server disabled POSIX path support"));
1997 }
1998 }
1999
2000 cap &= CIFS_UNIX_CAP_MASK;
2001 if (vol_info && vol_info->no_psx_acl)
2002 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
2003 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
2004 cFYI(1, ("negotiated posix acl support"));
2005 if (sb)
2006 sb->s_flags |= MS_POSIXACL;
2007 }
2008
2009 if (vol_info && vol_info->posix_paths == 0)
2010 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
2011 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
2012 cFYI(1, ("negotiate posix pathnames"));
2013 if (sb)
2014 CIFS_SB(sb)->mnt_cifs_flags |=
2015 CIFS_MOUNT_POSIX_PATHS;
2016 }
2017
2018 /* We might be setting the path sep back to a different
2019 form if we are reconnecting and the server switched its
2020 posix path capability for this share */
2021 if (sb && (CIFS_SB(sb)->prepathlen > 0))
2022 CIFS_SB(sb)->prepath[0] = CIFS_DIR_SEP(CIFS_SB(sb));
2023
2024 if (sb && (CIFS_SB(sb)->rsize > 127 * 1024)) {
2025 if ((cap & CIFS_UNIX_LARGE_READ_CAP) == 0) {
2026 CIFS_SB(sb)->rsize = 127 * 1024;
2027 cFYI(DBG2,
2028 ("larger reads not supported by srv"));
2029 }
2030 }
2031
2032
2033 cFYI(1, ("Negotiate caps 0x%x", (int)cap));
2034 #ifdef CONFIG_CIFS_DEBUG2
2035 if (cap & CIFS_UNIX_FCNTL_CAP)
2036 cFYI(1, ("FCNTL cap"));
2037 if (cap & CIFS_UNIX_EXTATTR_CAP)
2038 cFYI(1, ("EXTATTR cap"));
2039 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
2040 cFYI(1, ("POSIX path cap"));
2041 if (cap & CIFS_UNIX_XATTR_CAP)
2042 cFYI(1, ("XATTR cap"));
2043 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
2044 cFYI(1, ("POSIX ACL cap"));
2045 if (cap & CIFS_UNIX_LARGE_READ_CAP)
2046 cFYI(1, ("very large read cap"));
2047 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
2048 cFYI(1, ("very large write cap"));
2049 #endif /* CIFS_DEBUG2 */
2050 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
2051 if (vol_info == NULL) {
2052 cFYI(1, ("resetting capabilities failed"));
2053 } else
2054 cERROR(1, ("Negotiating Unix capabilities "
2055 "with the server failed. Consider "
2056 "mounting with the Unix Extensions\n"
2057 "disabled, if problems are found, "
2058 "by specifying the nounix mount "
2059 "option."));
2060
2061 }
2062 }
2063 }
2064
2065 static void
2066 convert_delimiter(char *path, char delim)
2067 {
2068 int i;
2069 char old_delim;
2070
2071 if (path == NULL)
2072 return;
2073
2074 if (delim == '/')
2075 old_delim = '\\';
2076 else
2077 old_delim = '/';
2078
2079 for (i = 0; path[i] != '\0'; i++) {
2080 if (path[i] == old_delim)
2081 path[i] = delim;
2082 }
2083 }
2084
2085 static void setup_cifs_sb(struct smb_vol *pvolume_info,
2086 struct cifs_sb_info *cifs_sb)
2087 {
2088 if (pvolume_info->rsize > CIFSMaxBufSize) {
2089 cERROR(1, ("rsize %d too large, using MaxBufSize",
2090 pvolume_info->rsize));
2091 cifs_sb->rsize = CIFSMaxBufSize;
2092 } else if ((pvolume_info->rsize) &&
2093 (pvolume_info->rsize <= CIFSMaxBufSize))
2094 cifs_sb->rsize = pvolume_info->rsize;
2095 else /* default */
2096 cifs_sb->rsize = CIFSMaxBufSize;
2097
2098 if (pvolume_info->wsize > PAGEVEC_SIZE * PAGE_CACHE_SIZE) {
2099 cERROR(1, ("wsize %d too large, using 4096 instead",
2100 pvolume_info->wsize));
2101 cifs_sb->wsize = 4096;
2102 } else if (pvolume_info->wsize)
2103 cifs_sb->wsize = pvolume_info->wsize;
2104 else
2105 cifs_sb->wsize = min_t(const int,
2106 PAGEVEC_SIZE * PAGE_CACHE_SIZE,
2107 127*1024);
2108 /* old default of CIFSMaxBufSize was too small now
2109 that SMB Write2 can send multiple pages in kvec.
2110 RFC1001 does not describe what happens when frame
2111 bigger than 128K is sent so use that as max in
2112 conjunction with 52K kvec constraint on arch with 4K
2113 page size */
2114
2115 if (cifs_sb->rsize < 2048) {
2116 cifs_sb->rsize = 2048;
2117 /* Windows ME may prefer this */
2118 cFYI(1, ("readsize set to minimum: 2048"));
2119 }
2120 /* calculate prepath */
2121 cifs_sb->prepath = pvolume_info->prepath;
2122 if (cifs_sb->prepath) {
2123 cifs_sb->prepathlen = strlen(cifs_sb->prepath);
2124 /* we can not convert the / to \ in the path
2125 separators in the prefixpath yet because we do not
2126 know (until reset_cifs_unix_caps is called later)
2127 whether POSIX PATH CAP is available. We normalize
2128 the / to \ after reset_cifs_unix_caps is called */
2129 pvolume_info->prepath = NULL;
2130 } else
2131 cifs_sb->prepathlen = 0;
2132 cifs_sb->mnt_uid = pvolume_info->linux_uid;
2133 cifs_sb->mnt_gid = pvolume_info->linux_gid;
2134 cifs_sb->mnt_file_mode = pvolume_info->file_mode;
2135 cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
2136 cFYI(1, ("file mode: 0x%x dir mode: 0x%x",
2137 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode));
2138
2139 if (pvolume_info->noperm)
2140 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
2141 if (pvolume_info->setuids)
2142 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
2143 if (pvolume_info->server_ino)
2144 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
2145 if (pvolume_info->remap)
2146 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
2147 if (pvolume_info->no_xattr)
2148 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
2149 if (pvolume_info->sfu_emul)
2150 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
2151 if (pvolume_info->nobrl)
2152 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
2153 if (pvolume_info->nostrictsync)
2154 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
2155 if (pvolume_info->mand_lock)
2156 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
2157 if (pvolume_info->cifs_acl)
2158 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
2159 if (pvolume_info->override_uid)
2160 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
2161 if (pvolume_info->override_gid)
2162 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
2163 if (pvolume_info->dynperm)
2164 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
2165 if (pvolume_info->direct_io) {
2166 cFYI(1, ("mounting share using direct i/o"));
2167 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
2168 }
2169
2170 if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
2171 cERROR(1, ("mount option dynperm ignored if cifsacl "
2172 "mount option supported"));
2173 }
2174
2175 static int
2176 is_path_accessible(int xid, struct cifsTconInfo *tcon,
2177 struct cifs_sb_info *cifs_sb, const char *full_path)
2178 {
2179 int rc;
2180 __u64 inode_num;
2181 FILE_ALL_INFO *pfile_info;
2182
2183 rc = CIFSGetSrvInodeNumber(xid, tcon, full_path, &inode_num,
2184 cifs_sb->local_nls,
2185 cifs_sb->mnt_cifs_flags &
2186 CIFS_MOUNT_MAP_SPECIAL_CHR);
2187 if (rc != -EOPNOTSUPP)
2188 return rc;
2189
2190 pfile_info = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
2191 if (pfile_info == NULL)
2192 return -ENOMEM;
2193
2194 rc = CIFSSMBQPathInfo(xid, tcon, full_path, pfile_info,
2195 0 /* not legacy */, cifs_sb->local_nls,
2196 cifs_sb->mnt_cifs_flags &
2197 CIFS_MOUNT_MAP_SPECIAL_CHR);
2198 kfree(pfile_info);
2199 return rc;
2200 }
2201
2202 static void
2203 cleanup_volume_info(struct smb_vol **pvolume_info)
2204 {
2205 struct smb_vol *volume_info;
2206
2207 if (!pvolume_info && !*pvolume_info)
2208 return;
2209
2210 volume_info = *pvolume_info;
2211 kzfree(volume_info->password);
2212 kfree(volume_info->UNC);
2213 kfree(volume_info->prepath);
2214 kfree(volume_info);
2215 *pvolume_info = NULL;
2216 return;
2217 }
2218
2219 #ifdef CONFIG_CIFS_DFS_UPCALL
2220 /* build_path_to_root returns full path to root when
2221 * we do not have an exiting connection (tcon) */
2222 static char *
2223 build_unc_path_to_root(const struct smb_vol *volume_info,
2224 const struct cifs_sb_info *cifs_sb)
2225 {
2226 char *full_path;
2227
2228 int unc_len = strnlen(volume_info->UNC, MAX_TREE_SIZE + 1);
2229 full_path = kmalloc(unc_len + cifs_sb->prepathlen + 1, GFP_KERNEL);
2230 if (full_path == NULL)
2231 return ERR_PTR(-ENOMEM);
2232
2233 strncpy(full_path, volume_info->UNC, unc_len);
2234 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
2235 int i;
2236 for (i = 0; i < unc_len; i++) {
2237 if (full_path[i] == '\\')
2238 full_path[i] = '/';
2239 }
2240 }
2241
2242 if (cifs_sb->prepathlen)
2243 strncpy(full_path + unc_len, cifs_sb->prepath,
2244 cifs_sb->prepathlen);
2245
2246 full_path[unc_len + cifs_sb->prepathlen] = 0; /* add trailing null */
2247 return full_path;
2248 }
2249 #endif
2250
2251 int
2252 cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
2253 char *mount_data_global, const char *devname)
2254 {
2255 int rc = 0;
2256 int xid;
2257 struct smb_vol *volume_info;
2258 struct cifsSesInfo *pSesInfo = NULL;
2259 struct cifsTconInfo *tcon = NULL;
2260 struct TCP_Server_Info *srvTcp = NULL;
2261 char *full_path;
2262 char *mount_data = mount_data_global;
2263 #ifdef CONFIG_CIFS_DFS_UPCALL
2264 struct dfs_info3_param *referrals = NULL;
2265 unsigned int num_referrals = 0;
2266 int referral_walks_count = 0;
2267 try_mount_again:
2268 #endif
2269 full_path = NULL;
2270
2271 xid = GetXid();
2272
2273 volume_info = kzalloc(sizeof(struct smb_vol), GFP_KERNEL);
2274 if (!volume_info) {
2275 rc = -ENOMEM;
2276 goto out;
2277 }
2278
2279 if (cifs_parse_mount_options(mount_data, devname, volume_info)) {
2280 rc = -EINVAL;
2281 goto out;
2282 }
2283
2284 if (volume_info->nullauth) {
2285 cFYI(1, ("null user"));
2286 volume_info->username = "";
2287 } else if (volume_info->username) {
2288 /* BB fixme parse for domain name here */
2289 cFYI(1, ("Username: %s", volume_info->username));
2290 } else {
2291 cifserror("No username specified");
2292 /* In userspace mount helper we can get user name from alternate
2293 locations such as env variables and files on disk */
2294 rc = -EINVAL;
2295 goto out;
2296 }
2297
2298
2299 /* this is needed for ASCII cp to Unicode converts */
2300 if (volume_info->iocharset == NULL) {
2301 cifs_sb->local_nls = load_nls_default();
2302 /* load_nls_default can not return null */
2303 } else {
2304 cifs_sb->local_nls = load_nls(volume_info->iocharset);
2305 if (cifs_sb->local_nls == NULL) {
2306 cERROR(1, ("CIFS mount error: iocharset %s not found",
2307 volume_info->iocharset));
2308 rc = -ELIBACC;
2309 goto out;
2310 }
2311 }
2312
2313 /* get a reference to a tcp session */
2314 srvTcp = cifs_get_tcp_session(volume_info);
2315 if (IS_ERR(srvTcp)) {
2316 rc = PTR_ERR(srvTcp);
2317 goto out;
2318 }
2319
2320 pSesInfo = cifs_find_smb_ses(srvTcp, volume_info->username);
2321 if (pSesInfo) {
2322 cFYI(1, ("Existing smb sess found (status=%d)",
2323 pSesInfo->status));
2324 /*
2325 * The existing SMB session already has a reference to srvTcp,
2326 * so we can put back the extra one we got before
2327 */
2328 cifs_put_tcp_session(srvTcp);
2329
2330 down(&pSesInfo->sesSem);
2331 if (pSesInfo->need_reconnect) {
2332 cFYI(1, ("Session needs reconnect"));
2333 rc = cifs_setup_session(xid, pSesInfo,
2334 cifs_sb->local_nls);
2335 }
2336 up(&pSesInfo->sesSem);
2337 } else if (!rc) {
2338 cFYI(1, ("Existing smb sess not found"));
2339 pSesInfo = sesInfoAlloc();
2340 if (pSesInfo == NULL) {
2341 rc = -ENOMEM;
2342 goto mount_fail_check;
2343 }
2344
2345 /* new SMB session uses our srvTcp ref */
2346 pSesInfo->server = srvTcp;
2347 if (srvTcp->addr.sockAddr6.sin6_family == AF_INET6)
2348 sprintf(pSesInfo->serverName, "%pI6",
2349 &srvTcp->addr.sockAddr6.sin6_addr);
2350 else
2351 sprintf(pSesInfo->serverName, "%pI4",
2352 &srvTcp->addr.sockAddr.sin_addr.s_addr);
2353
2354 write_lock(&cifs_tcp_ses_lock);
2355 list_add(&pSesInfo->smb_ses_list, &srvTcp->smb_ses_list);
2356 write_unlock(&cifs_tcp_ses_lock);
2357
2358 /* volume_info->password freed at unmount */
2359 if (volume_info->password) {
2360 pSesInfo->password = kstrdup(volume_info->password,
2361 GFP_KERNEL);
2362 if (!pSesInfo->password) {
2363 rc = -ENOMEM;
2364 goto mount_fail_check;
2365 }
2366 }
2367 if (volume_info->username)
2368 strncpy(pSesInfo->userName, volume_info->username,
2369 MAX_USERNAME_SIZE);
2370 if (volume_info->domainname) {
2371 int len = strlen(volume_info->domainname);
2372 pSesInfo->domainName = kmalloc(len + 1, GFP_KERNEL);
2373 if (pSesInfo->domainName)
2374 strcpy(pSesInfo->domainName,
2375 volume_info->domainname);
2376 }
2377 pSesInfo->linux_uid = volume_info->linux_uid;
2378 pSesInfo->overrideSecFlg = volume_info->secFlg;
2379 down(&pSesInfo->sesSem);
2380
2381 /* BB FIXME need to pass vol->secFlgs BB */
2382 rc = cifs_setup_session(xid, pSesInfo,
2383 cifs_sb->local_nls);
2384 up(&pSesInfo->sesSem);
2385 }
2386
2387 /* search for existing tcon to this server share */
2388 if (!rc) {
2389 setup_cifs_sb(volume_info, cifs_sb);
2390
2391 tcon = cifs_find_tcon(pSesInfo, volume_info->UNC);
2392 if (tcon) {
2393 cFYI(1, ("Found match on UNC path"));
2394 /* existing tcon already has a reference */
2395 cifs_put_smb_ses(pSesInfo);
2396 if (tcon->seal != volume_info->seal)
2397 cERROR(1, ("transport encryption setting "
2398 "conflicts with existing tid"));
2399 } else {
2400 tcon = tconInfoAlloc();
2401 if (tcon == NULL) {
2402 rc = -ENOMEM;
2403 goto mount_fail_check;
2404 }
2405
2406 tcon->ses = pSesInfo;
2407 if (volume_info->password) {
2408 tcon->password = kstrdup(volume_info->password,
2409 GFP_KERNEL);
2410 if (!tcon->password) {
2411 rc = -ENOMEM;
2412 goto mount_fail_check;
2413 }
2414 }
2415
2416 if ((strchr(volume_info->UNC + 3, '\\') == NULL)
2417 && (strchr(volume_info->UNC + 3, '/') == NULL)) {
2418 cERROR(1, ("Missing share name"));
2419 rc = -ENODEV;
2420 goto mount_fail_check;
2421 } else {
2422 /* BB Do we need to wrap sesSem around
2423 * this TCon call and Unix SetFS as
2424 * we do on SessSetup and reconnect? */
2425 rc = CIFSTCon(xid, pSesInfo, volume_info->UNC,
2426 tcon, cifs_sb->local_nls);
2427 cFYI(1, ("CIFS Tcon rc = %d", rc));
2428 if (volume_info->nodfs) {
2429 tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
2430 cFYI(1, ("DFS disabled (%d)",
2431 tcon->Flags));
2432 }
2433 }
2434 if (rc)
2435 goto remote_path_check;
2436 tcon->seal = volume_info->seal;
2437 write_lock(&cifs_tcp_ses_lock);
2438 list_add(&tcon->tcon_list, &pSesInfo->tcon_list);
2439 write_unlock(&cifs_tcp_ses_lock);
2440 }
2441
2442 /* we can have only one retry value for a connection
2443 to a share so for resources mounted more than once
2444 to the same server share the last value passed in
2445 for the retry flag is used */
2446 tcon->retry = volume_info->retry;
2447 tcon->nocase = volume_info->nocase;
2448 tcon->local_lease = volume_info->local_lease;
2449 }
2450 if (pSesInfo) {
2451 if (pSesInfo->capabilities & CAP_LARGE_FILES) {
2452 sb->s_maxbytes = (u64) 1 << 63;
2453 } else
2454 sb->s_maxbytes = (u64) 1 << 31; /* 2 GB */
2455 }
2456
2457 /* BB FIXME fix time_gran to be larger for LANMAN sessions */
2458 sb->s_time_gran = 100;
2459
2460 if (rc)
2461 goto remote_path_check;
2462
2463 cifs_sb->tcon = tcon;
2464
2465 /* do not care if following two calls succeed - informational */
2466 if (!tcon->ipc) {
2467 CIFSSMBQFSDeviceInfo(xid, tcon);
2468 CIFSSMBQFSAttributeInfo(xid, tcon);
2469 }
2470
2471 /* tell server which Unix caps we support */
2472 if (tcon->ses->capabilities & CAP_UNIX)
2473 /* reset of caps checks mount to see if unix extensions
2474 disabled for just this mount */
2475 reset_cifs_unix_caps(xid, tcon, sb, volume_info);
2476 else
2477 tcon->unix_ext = 0; /* server does not support them */
2478
2479 /* convert forward to back slashes in prepath here if needed */
2480 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) == 0)
2481 convert_delimiter(cifs_sb->prepath, CIFS_DIR_SEP(cifs_sb));
2482
2483 if ((tcon->unix_ext == 0) && (cifs_sb->rsize > (1024 * 127))) {
2484 cifs_sb->rsize = 1024 * 127;
2485 cFYI(DBG2, ("no very large read support, rsize now 127K"));
2486 }
2487 if (!(tcon->ses->capabilities & CAP_LARGE_WRITE_X))
2488 cifs_sb->wsize = min(cifs_sb->wsize,
2489 (tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE));
2490 if (!(tcon->ses->capabilities & CAP_LARGE_READ_X))
2491 cifs_sb->rsize = min(cifs_sb->rsize,
2492 (tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE));
2493
2494 remote_path_check:
2495 /* check if a whole path (including prepath) is not remote */
2496 if (!rc && cifs_sb->prepathlen && tcon) {
2497 /* build_path_to_root works only when we have a valid tcon */
2498 full_path = cifs_build_path_to_root(cifs_sb);
2499 if (full_path == NULL) {
2500 rc = -ENOMEM;
2501 goto mount_fail_check;
2502 }
2503 rc = is_path_accessible(xid, tcon, cifs_sb, full_path);
2504 if (rc != -EREMOTE) {
2505 kfree(full_path);
2506 goto mount_fail_check;
2507 }
2508 kfree(full_path);
2509 }
2510
2511 /* get referral if needed */
2512 if (rc == -EREMOTE) {
2513 #ifdef CONFIG_CIFS_DFS_UPCALL
2514 if (referral_walks_count > MAX_NESTED_LINKS) {
2515 /*
2516 * BB: when we implement proper loop detection,
2517 * we will remove this check. But now we need it
2518 * to prevent an indefinite loop if 'DFS tree' is
2519 * misconfigured (i.e. has loops).
2520 */
2521 rc = -ELOOP;
2522 goto mount_fail_check;
2523 }
2524 /* convert forward to back slashes in prepath here if needed */
2525 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) == 0)
2526 convert_delimiter(cifs_sb->prepath,
2527 CIFS_DIR_SEP(cifs_sb));
2528 full_path = build_unc_path_to_root(volume_info, cifs_sb);
2529 if (IS_ERR(full_path)) {
2530 rc = PTR_ERR(full_path);
2531 goto mount_fail_check;
2532 }
2533
2534 cFYI(1, ("Getting referral for: %s", full_path));
2535 rc = get_dfs_path(xid, pSesInfo , full_path + 1,
2536 cifs_sb->local_nls, &num_referrals, &referrals,
2537 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
2538 if (!rc && num_referrals > 0) {
2539 char *fake_devname = NULL;
2540
2541 if (mount_data != mount_data_global)
2542 kfree(mount_data);
2543 mount_data = cifs_compose_mount_options(
2544 cifs_sb->mountdata, full_path + 1,
2545 referrals, &fake_devname);
2546 kfree(fake_devname);
2547 free_dfs_info_array(referrals, num_referrals);
2548
2549 if (tcon)
2550 cifs_put_tcon(tcon);
2551 else if (pSesInfo)
2552 cifs_put_smb_ses(pSesInfo);
2553
2554 cleanup_volume_info(&volume_info);
2555 FreeXid(xid);
2556 kfree(full_path);
2557 referral_walks_count++;
2558 goto try_mount_again;
2559 }
2560 #else /* No DFS support, return error on mount */
2561 rc = -EOPNOTSUPP;
2562 #endif
2563 }
2564
2565 mount_fail_check:
2566 /* on error free sesinfo and tcon struct if needed */
2567 if (rc) {
2568 if (mount_data != mount_data_global)
2569 kfree(mount_data);
2570 /* If find_unc succeeded then rc == 0 so we can not end */
2571 /* up accidently freeing someone elses tcon struct */
2572 if (tcon)
2573 cifs_put_tcon(tcon);
2574 else if (pSesInfo)
2575 cifs_put_smb_ses(pSesInfo);
2576 else
2577 cifs_put_tcp_session(srvTcp);
2578 goto out;
2579 }
2580
2581 /* volume_info->password is freed above when existing session found
2582 (in which case it is not needed anymore) but when new sesion is created
2583 the password ptr is put in the new session structure (in which case the
2584 password will be freed at unmount time) */
2585 out:
2586 /* zero out password before freeing */
2587 cleanup_volume_info(&volume_info);
2588 FreeXid(xid);
2589 return rc;
2590 }
2591
2592 int
2593 CIFSTCon(unsigned int xid, struct cifsSesInfo *ses,
2594 const char *tree, struct cifsTconInfo *tcon,
2595 const struct nls_table *nls_codepage)
2596 {
2597 struct smb_hdr *smb_buffer;
2598 struct smb_hdr *smb_buffer_response;
2599 TCONX_REQ *pSMB;
2600 TCONX_RSP *pSMBr;
2601 unsigned char *bcc_ptr;
2602 int rc = 0;
2603 int length, bytes_left;
2604 __u16 count;
2605
2606 if (ses == NULL)
2607 return -EIO;
2608
2609 smb_buffer = cifs_buf_get();
2610 if (smb_buffer == NULL) {
2611 return -ENOMEM;
2612 }
2613 smb_buffer_response = smb_buffer;
2614
2615 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
2616 NULL /*no tid */ , 4 /*wct */ );
2617
2618 smb_buffer->Mid = GetNextMid(ses->server);
2619 smb_buffer->Uid = ses->Suid;
2620 pSMB = (TCONX_REQ *) smb_buffer;
2621 pSMBr = (TCONX_RSP *) smb_buffer_response;
2622
2623 pSMB->AndXCommand = 0xFF;
2624 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
2625 bcc_ptr = &pSMB->Password[0];
2626 if ((ses->server->secMode) & SECMODE_USER) {
2627 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
2628 *bcc_ptr = 0; /* password is null byte */
2629 bcc_ptr++; /* skip password */
2630 /* already aligned so no need to do it below */
2631 } else {
2632 pSMB->PasswordLength = cpu_to_le16(CIFS_SESS_KEY_SIZE);
2633 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
2634 specified as required (when that support is added to
2635 the vfs in the future) as only NTLM or the much
2636 weaker LANMAN (which we do not send by default) is accepted
2637 by Samba (not sure whether other servers allow
2638 NTLMv2 password here) */
2639 #ifdef CONFIG_CIFS_WEAK_PW_HASH
2640 if ((extended_security & CIFSSEC_MAY_LANMAN) &&
2641 (ses->server->secType == LANMAN))
2642 calc_lanman_hash(tcon->password, ses->server->cryptKey,
2643 ses->server->secMode &
2644 SECMODE_PW_ENCRYPT ? true : false,
2645 bcc_ptr);
2646 else
2647 #endif /* CIFS_WEAK_PW_HASH */
2648 SMBNTencrypt(tcon->password, ses->server->cryptKey,
2649 bcc_ptr);
2650
2651 bcc_ptr += CIFS_SESS_KEY_SIZE;
2652 if (ses->capabilities & CAP_UNICODE) {
2653 /* must align unicode strings */
2654 *bcc_ptr = 0; /* null byte password */
2655 bcc_ptr++;
2656 }
2657 }
2658
2659 if (ses->server->secMode &
2660 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
2661 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
2662
2663 if (ses->capabilities & CAP_STATUS32) {
2664 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
2665 }
2666 if (ses->capabilities & CAP_DFS) {
2667 smb_buffer->Flags2 |= SMBFLG2_DFS;
2668 }
2669 if (ses->capabilities & CAP_UNICODE) {
2670 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
2671 length =
2672 cifs_strtoUCS((__le16 *) bcc_ptr, tree,
2673 6 /* max utf8 char length in bytes */ *
2674 (/* server len*/ + 256 /* share len */), nls_codepage);
2675 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
2676 bcc_ptr += 2; /* skip trailing null */
2677 } else { /* ASCII */
2678 strcpy(bcc_ptr, tree);
2679 bcc_ptr += strlen(tree) + 1;
2680 }
2681 strcpy(bcc_ptr, "?????");
2682 bcc_ptr += strlen("?????");
2683 bcc_ptr += 1;
2684 count = bcc_ptr - &pSMB->Password[0];
2685 pSMB->hdr.smb_buf_length += count;
2686 pSMB->ByteCount = cpu_to_le16(count);
2687
2688 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
2689 CIFS_STD_OP);
2690
2691 /* above now done in SendReceive */
2692 if ((rc == 0) && (tcon != NULL)) {
2693 bool is_unicode;
2694
2695 tcon->tidStatus = CifsGood;
2696 tcon->need_reconnect = false;
2697 tcon->tid = smb_buffer_response->Tid;
2698 bcc_ptr = pByteArea(smb_buffer_response);
2699 bytes_left = BCC(smb_buffer_response);
2700 length = strnlen(bcc_ptr, bytes_left - 2);
2701 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
2702 is_unicode = true;
2703 else
2704 is_unicode = false;
2705
2706
2707 /* skip service field (NB: this field is always ASCII) */
2708 if (length == 3) {
2709 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
2710 (bcc_ptr[2] == 'C')) {
2711 cFYI(1, ("IPC connection"));
2712 tcon->ipc = 1;
2713 }
2714 } else if (length == 2) {
2715 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
2716 /* the most common case */
2717 cFYI(1, ("disk share connection"));
2718 }
2719 }
2720 bcc_ptr += length + 1;
2721 bytes_left -= (length + 1);
2722 strncpy(tcon->treeName, tree, MAX_TREE_SIZE);
2723
2724 /* mostly informational -- no need to fail on error here */
2725 tcon->nativeFileSystem = cifs_strndup_from_ucs(bcc_ptr,
2726 bytes_left, is_unicode,
2727 nls_codepage);
2728
2729 cFYI(1, ("nativeFileSystem=%s", tcon->nativeFileSystem));
2730
2731 if ((smb_buffer_response->WordCount == 3) ||
2732 (smb_buffer_response->WordCount == 7))
2733 /* field is in same location */
2734 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
2735 else
2736 tcon->Flags = 0;
2737 cFYI(1, ("Tcon flags: 0x%x ", tcon->Flags));
2738 } else if ((rc == 0) && tcon == NULL) {
2739 /* all we need to save for IPC$ connection */
2740 ses->ipc_tid = smb_buffer_response->Tid;
2741 }
2742
2743 cifs_buf_release(smb_buffer);
2744 return rc;
2745 }
2746
2747 int
2748 cifs_umount(struct super_block *sb, struct cifs_sb_info *cifs_sb)
2749 {
2750 int rc = 0;
2751 char *tmp;
2752
2753 if (cifs_sb->tcon)
2754 cifs_put_tcon(cifs_sb->tcon);
2755
2756 cifs_sb->tcon = NULL;
2757 tmp = cifs_sb->prepath;
2758 cifs_sb->prepathlen = 0;
2759 cifs_sb->prepath = NULL;
2760 kfree(tmp);
2761
2762 return rc;
2763 }
2764
2765 int cifs_setup_session(unsigned int xid, struct cifsSesInfo *pSesInfo,
2766 struct nls_table *nls_info)
2767 {
2768 int rc = 0;
2769 int first_time = 0;
2770 struct TCP_Server_Info *server = pSesInfo->server;
2771
2772 /* what if server changes its buffer size after dropping the session? */
2773 if (server->maxBuf == 0) /* no need to send on reconnect */ {
2774 rc = CIFSSMBNegotiate(xid, pSesInfo);
2775 if (rc == -EAGAIN) {
2776 /* retry only once on 1st time connection */
2777 rc = CIFSSMBNegotiate(xid, pSesInfo);
2778 if (rc == -EAGAIN)
2779 rc = -EHOSTDOWN;
2780 }
2781 if (rc == 0) {
2782 spin_lock(&GlobalMid_Lock);
2783 if (server->tcpStatus != CifsExiting)
2784 server->tcpStatus = CifsGood;
2785 else
2786 rc = -EHOSTDOWN;
2787 spin_unlock(&GlobalMid_Lock);
2788
2789 }
2790 first_time = 1;
2791 }
2792
2793 if (rc)
2794 goto ss_err_exit;
2795
2796 pSesInfo->flags = 0;
2797 pSesInfo->capabilities = server->capabilities;
2798 if (linuxExtEnabled == 0)
2799 pSesInfo->capabilities &= (~CAP_UNIX);
2800
2801 cFYI(1, ("Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d",
2802 server->secMode, server->capabilities, server->timeAdj));
2803
2804 rc = CIFS_SessSetup(xid, pSesInfo, first_time, nls_info);
2805 if (rc) {
2806 cERROR(1, ("Send error in SessSetup = %d", rc));
2807 } else {
2808 cFYI(1, ("CIFS Session Established successfully"));
2809 spin_lock(&GlobalMid_Lock);
2810 pSesInfo->status = CifsGood;
2811 pSesInfo->need_reconnect = false;
2812 spin_unlock(&GlobalMid_Lock);
2813 }
2814
2815 ss_err_exit:
2816 return rc;
2817 }
2818
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